Showing all 865 terms
A56 terms
- ABCDE ruleMakeup
- Asymmetry, Border, Color, Diameter, Evolution - for evaluating suspicious pigmented lesions.
- AbsorptionSkin Structure and Physiology
- The skin's role of taking in small amounts of certain substances from skincare products.
- Achilles tendonNail Anatomy and Physiology
- The combined tendon of the gastrocnemius and soleus muscles.
- Acid mantleAnatomy, Physiology, and Skin Science
- The slightly acidic film of sebum and sweat on the skin surface, about pH 4.5 to 5.5, that discourages microbes and slows water loss.
- AcidicChemistry, Ingredients, and Formulation
- A product with a pH below 7.
- Acne vulgarisSafety and Infection Control
- Because it is non-contagious, a facial may proceed with appropriate modifications.
- Active cold soresHair Removal
- Avoid hair removal directly over an active cold sore.
- Active electrodeEquipment and Technique
- The electrode inserted into the hair follicle - where the treatment effect happens.
- Active eye infectionLash and Brow Services
- Conjunctivitis or similar means decline the service and refer for medical care.
- Active vs. passive immunityInfection Control and Regulation
- Active (vaccination or infection) builds lasting memory B-cells; passive is borrowed, temporary antibody.
- Adhesive fumesLash and Brow Services
- Can irritate eyes, skin, and the respiratory tract - ventilation matters.
- AlbinismSkin Analysis, Disorders, and Lesions
- A congenital condition in which the body produces little or no melanin, resulting in very light skin, hair, and eyes.
- Alkaline cuticle removerChemistry of Nail Products
- Cuticle remover's high pH (8 - 9) dissolves dead tissue but disrupts the acid mantle and irritates living skin.
- Alopecia AreataHair Biology and Removal Science
- A condition in which hair loss occurs in smooth, round patches, typically caused by an autoimmune response attacking the hair follicle.
- Alopecia areataClient Consultation and Hair, Skin, and Nail Analysis
- Hair loss appearing as sudden, patchy, round bald spots.
- Alopecia totalisHair and Scalp Science
- Complete loss of all scalp hair.
- Alopecia universalisClient Consultation and Hair and Skin Analysis
- Total loss of all body hair, including eyebrows and eyelashes.
- Alpha → beta keratinHair Science and Structure
- When hair is stretched beyond its elastic limit, alpha-helices unfold into an extended flat beta configuration.
- Alpha-hydroxy acidsChemistry, Products, and Practice
- Lower the skin's pH and loosen corneodesmosomes, releasing dead surface cells.
- AlumShaving
- The astringent aluminum salt that is the active ingredient in most styptics, used to stop minor bleeding.
- Alum blockShaving
- Applied during or after a shave to close pores and soothe minor irritation.
- AmmoniaHaircoloring
- The alkaline agent that swells the cuticle so color can enter.
- Ammonia's functionHaircoloring
- Swells the hair and raises the cuticle so color can enter.
- Ammonium bisulfite permChemical Texture Services
- A gentler wave: a weaker reducing agent that breaks fewer bonds, more slowly.
- AmpacityElectrical Science
- The maximum current a conductor can safely carry without overheating.
- Amphoteric surfactantsChemistry, Ingredients, and Formulation
- Carry both positive and negative charges depending on pH - gentle and low-irritation.
- AnabolismSkin Structure and Physiology
- The constructive phase of metabolism, in which the body builds larger molecules and stores energy.
- AnagenClient Consultation and Analysis
- The active growth phase of the hair cycle during which the hair matrix cells are dividing and producing new hair.
- Anagen effluviumSkin Analysis, Disorders, and Lesions
- Hair loss during the active growth phase, typically from chemotherapy or radiation.
- Anagen proportionHair Removal
- Roughly 85 - 90% of scalp hair is in anagen at any given time.
- AnaphoresisThe Three Modalities
- Galvanic current used to soften skin and open follicle openings before treatment, easing insertion.
- AnatomyAnatomy, Physiology, and Skin Science
- The study of the structures of the body and how they relate to one another.
- Andre Walker systemHair Biology and Removal Science
- The classification system that categorizes natural hair into four numbered types (1 through 4) with lettered subtypes (a, b, c).
- Androgenic AlopeciaHair Biology and Removal Science
- The most common form of progressive hair loss in men and women, attributed to genetic sensitivity to dihydrotestosterone (DHT).
- AnhidrosisSkin, Products, and Safety
- Inability to produce normal amounts of sweat, raising overheating risk.
- AnhydrousChemistry, Ingredients, and Formulation
- A product containing no water in its formulation.
- AnodeEquipment and Technique
- The positive electrode in a Galvanic circuit.
- Anticoagulant screeningClient Consultation and Analysis
- Blood thinners - including daily low-dose aspirin - mean expect bruising and consult first.
- ApexNail Enhancement Services
- The highest structural point - the arch over zone 2 - that gives the enhancement its strength.
- Apex (arch)Nail Care
- The highest point of a nail enhancement, which gives it strength.
- AquaChemistry, Products, and Practice
- Water, listed by its Latin INCI name and typically the base of the formula.
- ArchingHaircutting
- Shaping the hair around and behind the ears.
- AromatherapyTreatments, Modalities, and Technique
- Therapeutic use of plant-derived essential oils, applied topically or by inhalation.
- Arrector piliAnatomy, Physiology, and Skin Science
- The muscle at each follicle that contracts to erect the hair, producing goosebumps (cutis anserina).
- Arrector pili / pilomotorFacial Anatomy
- Sympathetic stimulation of the arrector pili smooth muscles, making hair stand on end (goosebumps).
- Arrector pili controlHair and Follicle Biology
- Controlled by the autonomic nervous system, responding involuntarily to cold, fear, or emotion.
- ArteriesSkin Structure and Physiology
- Blood vessels that carry oxygenated blood away from the heart to body tissues.
- AsepsisSafety and Infection Control
- Procedures that prevent contamination and maintain clean conditions.
- Aseptic fieldInfection Control and Regulation
- The work area kept free of pathogenic microorganisms during the procedure through draping and single-use setup.
- Aseptic techniqueInfection Control and Regulation
- Practices used to prevent contamination and reduce infection risk during treatment.
- AshHaircoloring
- A cool tonal family; ash shades carry blue/green undertones that neutralize warmth.
- AstringentShaving
- An aftershave product that cools the skin and tightens the pores (contrast: an antiseptic aftershave soothes and limits infection).
- Astringent aftershaveShaving
- An alcohol-based lotion applied after the shave, suited to oily skin with enlarged pores.
- Asynchronous cyclingHair Science and Structure
- Human follicles cycle independently - each in a different phase at once - unlike seasonal molting mammals.
- AtrophySkin Analysis, Disorders, and Lesions
- Thinning of the skin resulting in a translucent, paper-like appearance.
- AutoclaveInfection Control and Regulation
- Sterilizes with pressurized steam at high temperature for a set time, destroying all microbial life including spores.
B52 terms
- Babylights + balayageColor and Chemical Services
- Fine highlight dimension at the root combined with soft painted mid-length brightness.
- BacilliInfection Control, Regulation, and Practice
- Rod-shaped bacteria that can produce protective spores allowing them to survive harsh conditions.
- BackcombingHairstyling
- Pushing hair back toward the scalp so the cuticle scales lock, creating volume.
- Backcombing (teasing)Hairstyling
- Pushing hair back toward the scalp so the cuticle scales lock, creating volume.
- BackfillNail Enhancement Services
- Using an e-file to remove the old smile line and reshape the stress area during French maintenance.
- Backhand positionShaving
- A razor position that lets the barber reach areas the freehand stroke cannot.
- BacteriaInfection Control, Regulation, and Practice
- The general term for one-celled microorganisms that exhibit both plant and animal characteristics.
- BactericidalInfection Control and Regulation
- Capable of killing bacteria on surfaces when used per label directions.
- Balance pointNail Enhancement Services
- The point where the enhancement's weight and structure are in optimal balance.
- BalayageHaircoloring
- Freehand-painted highlights concentrated mid-shaft to ends with a soft, blurred grow-out.
- BalneotherapyTreatments, Modalities, and Technique
- Therapeutic bathing in mineral-rich natural or prepared waters.
- BandingHaircoloring
- Bands of uneven color along the strand.
- Bantu knotSkin, Products, and Safety
- Twisting sections and coiling them into small knots against the scalp.
- Base creamChemical Texture Services
- A protective barrier applied to the scalp and hairline before a sodium hydroxide relaxer.
- Base directionCutting Technique
- The curl's position relative to its section at the scalp, controlling root volume.
- BBSFacial Hair and Shaving
- A shave requiring multiple passes including against-the-grain, with higher irritation risk.
- BeadChemistry of Nail Products
- Formed when a brush loaded with monomer picks up polymer powder, creating a monomer-saturated bead.
- Beard outliningShaving
- The beard shape is created by shaving away the hair outside the lines.
- Beard softeningShaving
- Heat and moisture soften the beard by swelling the hair and raising its cuticle.
- Beau's linesClient Consultation and Hair, Skin, and Nail Analysis
- Transverse (horizontal) grooves across the plate that grow out, reflecting a systemic disruption.
- BevelingHaircutting
- Cutting the perimeter at a slight angle rather than straight across, creating a softer edge that turns under.
- Bi-level haircutHaircutting
- Two distinctly different lengths on the same head.
- Big chopSkin, Products, and Safety
- Cutting off all chemically relaxed or damaged ends, leaving only new natural growth.
- Binary fissionHair Science and Structure
- The process by which bacteria multiply - one cell divides into two.
- BioburdenInfection Control and Regulation
- The number of microorganisms on an object before decontamination begins.
- Biohazard symbolInfection Control and Regulation
- Indicates contents or items may contain infectious material.
- Blade alignmentImplements and Equipment
- The position of the top (moving) blade relative to the bottom blade.
- Blade crescentImplements and Equipment
- The curved cutting edge between the heel and the point of the blade.
- Blade grindImplements and Equipment
- The cross-section shape of a straight razor's blade.
- Bleach 'turning'Haircoloring
- When bleach goes grayish or green-yellow, the persulfate is spent and it is no longer lifting.
- Blend (combination) epilatorThe Three Modalities
- An epilator offering both Galvanic and Thermolysis capability.
- Blend timer functionThe Three Modalities
- Controls the duration of simultaneous DC and AC delivery for consistency per follicle.
- Blocked napeHaircutting
- A blocked (squared) neckline is cut straight across the bottom.
- BlockingCutting Technique
- Roughly removing bulk length to establish the overall shape before refining details.
- Blunt cutHaircutting
- All hair cut to fall at one length with a clean solid edge - maximum weight, least texture.
- BobHaircutting
- A one-length perimeter cut at jaw, chin, or shoulder with minimal graduation.
- Body waveChemical Texture Services
- A perm using large-diameter rods for a loose, soft wave rather than a tight curl.
- Box braid sectioningTextured Hair, Extensions, and Styling
- Square or rectangular base partings across the scalp.
- BracingTechniques and Design
- Anchoring the working hand against the client's face or a stable surface for control.
- Breaking in a stropShaving
- A new leather strop is broken in to develop a smooth surface that finishes the edge.
- Bro flowMen's Cuts and Styles
- Medium-to-long length with natural movement, often tucked behind the ears.
- Broad spectrumChemistry, Ingredients, and Formulation
- Protects against both UVA (320 - 400 nm) and UVB (280 - 320 nm).
- Broad-spectrum preservative systemChemistry, Products, and Practice
- Protects a product from microbial contamination across bacteria, yeast, and mold.
- Broccoli cutMen's Cuts and Styles
- Short sides with curly or permed volume on top resembling broccoli florets in profile.
- Brow laminationEyelash and Eyebrow
- A service that chemically restructures brow hairs to hold a set, brushed-up direction.
- Brow-bone highlightMakeup
- A lighter eyeshadow on the brow bone highlights and lifts it.
- BufferHair and Product Chemistry
- A chemical system resisting pH change when small amounts of acid or alkali are added.
- Building saturation graduallyTechniques and Design
- Making multiple lighter passes, checking saturation between each.
- Bulge regionHair and Follicle Biology
- Contains stem cells that can regenerate the follicle if the papilla is not fully destroyed.
- BullaSkin Analysis, Disorders, and Lesions
- A large blister containing serous fluid, greater than 0.5 cm in diameter.
- Burning scalp duringChemical Texture Services
- Rinse immediately, assess, and refer for medical care if needed.
- Buzz cutMen's Cuts and Styles
- A uniform guard length across the entire head, with no fade or tapering.
C84 terms
- C curl vs. JLash and Brow Services
- C curl gives a more dramatic upward curve; J curl is a gentler, natural lift.
- C-curl and O-curlHaircutting and Design
- Classifications describing the tightness of the circle opening.
- C-curveNail Enhancement Services
- The cross-sectional arch of the nail from one lateral fold to the other.
- CalibrationNeedles, Machines, and Equipment
- Adjusting the machine's speed, voltage, and needle depth to the optimal settings for the procedure.
- CallusNail Disorders and Conditions
- Calluses are protective; complete removal exposes the tissue underneath.
- CanitiesSkin Analysis, Disorders, and Lesions
- Graying or whitening of hair from progressive loss of melanocyte activity in the bulb.
- CapacitorElectrical Science
- A component that stores electrical energy in an electric field for controlled release.
- Capping the free edgeManicure, Pedicure, and Nail Art
- Applying base and top coat along the underside of the free edge to seal the tip.
- CatagenHair Biology and Removal Science
- The transitional phase of the hair cycle, during which cell division stops and the follicle begins to shrink.
- CataphoresisThe Three Modalities
- Galvanic current used after treatment to constrict vessels, close follicles, and calm the skin (positive pole).
- CathodeEquipment and Technique
- The negative electrode in a Galvanic circuit - where lye is produced.
- CellSkin Structure and Physiology
- The basic structural and functional unit of all living organisms.
- CeramidesChemistry, Ingredients, and Formulation
- Lipid molecules replenishing the intercellular lipid matrix of the stratum corneum.
- Chain of custodyInfection Control and Regulation
- Documented tracking of contaminated sharps from disposal through transport and final treatment.
- Chain of infectionSafety and Infection Control
- The linked sequence a pathogen needs to spread; salon disinfection targets the mode of transmission link.
- Chemical changeChemical Texture Services
- A permanent alteration of the hair's molecular structure - perming, relaxing, oxidative color.
- Chemical depilatoryHair Removal
- Dissolves hair at the skin's surface rather than removing it from the root.
- ChemistryChemistry, Ingredients, and Formulation
- The branch of science that deals with the composition, structure, and properties of matter and the changes it undergoes.
- ChloasmaSkin Analysis, Disorders, and Lesions
- Patchy hyperpigmentation associated with hormonal change, such as pregnancy.
- Circulatory systemSkin Structure and Physiology
- The system that consists of the heart, blood, and blood vessels.
- Cleaning vs. disinfectingInfection Control and Safety
- Cleaning removes visible debris; disinfecting destroys pathogens - cleaning must come first.
- Client confidentialityChemistry, Products, and Practice
- Strict confidentiality, with information shared only on a need-to-know basis.
- Clipper leverHaircutting
- Adjusts how close the blade cuts.
- Clipper-over-combHaircutting
- Cuts and blends lengths a guard cannot reach.
- Closed comedoneSkin Analysis, Disorders, and Lesions
- A non-inflamed acne lesion formed by a plugged follicle covered by a thin layer of skin, appearing as a small white bump.
- Closest clipper cutHaircutting
- For the closest cut, clippers move against the direction of growth.
- Club hairHair Science and Structure
- The keratinized, rounded root end formed as catagen closes; the hair bearing it then rests loosely in the follicle through telogen until it sheds.
- Co-washSkin, Products, and Safety
- Cleansing with conditioning agents rather than detergent surfactants.
- Co-washingTextured Hair, Extensions, and Styling
- Cleansing the hair with conditioner instead of traditional shampoo.
- CoagulationThe Three Modalities
- Heat-induced destruction and solidification of tissue proteins at the probe tip.
- Coefficient of frictionHair Science and Structure
- The degree of surface friction between strands, determined by cuticle condition.
- CollagenSkin Structure and Physiology
- The protein in the dermis that gives skin its strength and structural support.
- ColonizationSafety and Infection Control
- Pathogens present in or on the body but not causing active disease or symptoms.
- Colony-forming unitInfection Control, Regulation, and Practice
- A microbiology count of viable organisms, measured by the visible colonies they form.
- Color bloomPigment, Color Theory, and Healing
- The gradual return of visible pigment color several weeks after the ghosting phase.
- Color fastnessHaircoloring
- A color's ability to resist fading from washing, UV, and the environment.
- Color meltingHaircoloring
- Blending colors seamlessly so there is no visible line of demarcation.
- Color modifierPigment, Color Theory, and Healing
- A pigment added to the primary color to adjust its undertone.
- Color removerHaircoloring
- Made to dissolve dye, to remove unwanted oxidative color.
- Color temperaturePigment, Color Theory, and Healing
- Whether a color leans warm (yellow/orange/red undertones) or cool (blue/green/violet undertones).
- Color valueMakeup
- The lightness or darkness of a color.
- Comb-over fadeMen's Cuts and Styles
- Side-parted longer hair swept over the top, with a faded side and back.
- Combination skinSkin and Nail Services
- Oily through the T-zone with normal to dry cheeks and outer face.
- ComedogenicInfection Control, Regulation, and Practice
- An ingredient or product likely to clog follicles and trigger comedones.
- Comedonal acneClient Consultation and Hair and Skin Analysis
- Mild, Grade I acne made up of blackheads and whiteheads (comedones).
- Communicable diseaseInfection Control and Safety
- A disease capable of spreading person to person by direct or indirect contact.
- Complementary neutralizingHaircoloring
- Blue or blue-violet neutralizes brassy orange, being its complement on the color wheel.
- ConductorElectrical Science
- A material that allows electrical current to flow through it easily.
- CongenitalSkin Analysis, Disorders, and Lesions
- A disease that is present at birth.
- Conjunctival fornixFacial Anatomy
- The fold where the eyelid conjunctiva meets the bulbar conjunctiva.
- Connected undercutMen's Cuts and Styles
- Unlike the disconnected version, it has some blending between the sides and top.
- Connective tissueSkin Structure and Physiology
- Tissue that supports, binds, and protects body structures, including bone, cartilage, and adipose tissue.
- Contact timeConsultation, Analysis, and Safety
- The minimum time a disinfectant must remain wet on a surface to achieve its stated kill claim.
- ContagiousSkin Analysis, Disorders, and Lesions
- A disease or disorder that is transmitted from one person to another by contact.
- ContaminatedSkin, Products, and Safety
- An item used on a client that may harbor microorganisms, debris, or chemical residue.
- Contaminated equipmentInfection Control and Regulation
- Equipment that has contacted blood or OPIM.
- ContaminationSafety and Infection Control
- Pathogens present on a surface or object, not necessarily causing disease.
- Contra-indication releaseConsultation, Analysis, and Safety
- A form used when a client insists on a service despite the designer's documented professional concerns.
- ContraindicationClient Consultation and Hair and Skin Analysis
- A condition or factor making a particular service inadvisable or unsafe.
- Contraindication vs. precautionInfection Control, Regulation, and Practice
- A precaution requires modification or extra screening but does not automatically preclude the service.
- Contributing pigmentHaircoloring
- The warm underlying pigment exposed as dark hair is lightened.
- Corrugated nailsNail Disorders and Conditions
- Longitudinal (lengthwise) waviness, often from habitual cuticle manipulation - unlike Beau's transverse grooves.
- CortexHair Biology and Removal Science
- The middle layer of the hair shaft that contains the melanin granules and fibrous proteins responsible for hair color, strength, and elasticity.
- Cortex fibril hierarchyHair Science and Structure
- Polypeptide chains → protofibril → microfibril → macrofibril, a twisted-cable structure.
- Cortical compromiseHair Structure and Disorders
- Hair that feels mushy and stretches without snapping back - broken disulfide bonds in the cortex.
- CosmeceuticalClient Consultation and Analysis
- A marketing term with no legal standing - the FDA recognizes only cosmetics and drugs.
- Couperose skinSkin Analysis, Disorders, and Lesions
- Diffuse surface telangiectasias; deep or vigorous massage causes vasodilation and worsens redness.
- Cross-checkingHaircutting
- Re-checking a haircut from another angle to catch unevenness.
- Cross-contaminationInfection Control and Regulation
- Transfer of pathogens between clients via contaminated instruments, surfaces, or hands.
- CrustSkin Analysis, Disorders, and Lesions
- A secondary lesion formed when a primary lesion such as a pustule dries and its contents solidify.
- Cupid's bowFacial Anatomy
- The double-peaked curve of the upper lip's vermilion border.
- CuringChemistry of Nail Products
- Hardening in which new covalent cross-links form between polymer chains - irreversible.
- Curly quiffMen's Cuts and Styles
- A quiff adapted for curly hair, preserving curl while directing volume up and back.
- Current vs. resistanceElectrical Science
- At constant voltage, current is inversely proportional to resistance - more resistance, less current.
- CuticleHair Biology and Removal Science
- The outermost layer of the hair shaft, composed of overlapping scale-like cells that protect the inner layers.
- Cuticle (hair)Client Consultation and Hair, Skin, and Nail Analysis
- The tough outermost layer of the hair shaft - overlapping scales protecting the cortex.
- Cuticle (nail)Client Consultation and Hair, Skin, and Nail Analysis
- The dead tissue adhering to the nail plate surface, safely removed in a manicure.
- Cutting on the biasHaircutting
- Cutting sections at an angle, producing a softer, diffused edge.
- CyanoacrylateChemistry of Nail Products
- The adhesive chemistry behind powder dip systems - the same family as super glue.
- CystSkin Analysis, Disorders, and Lesions
- A closed, sac-like lesion containing fluid or semi-solid matter beneath the skin surface.
- Cyst vs. noduleSkin Analysis, Disorders, and Lesions
- A cyst is an encapsulated sac containing fluid or semi-solid material; a nodule is solid.
- CysteineHair Biology and Removal Science
- The amino acid most responsible for the strength of the hair shaft through its role in disulfide bond formation.
- CystineHair Science and Structure
- The oxidized form of two cysteine residues linked by a disulfide bond - cystine is the disulfide bond.
- CytoplasmSkin Structure and Physiology
- The jelly-like substance inside a cell that surrounds the nucleus and contains organelles.
D39 terms
- Decline a close shaveShaving
- Declined when the skin shows inflamed, actively erupting razor bumps.
- Decontamination levelsSafety and Infection Control
- Cleaning (lowest) → disinfection → sterilization (highest).
- DehydratorNail Enhancement Services
- Removes surface moisture and oils so primer can properly contact and bond to the plate.
- Demarcation lineColor and Chemical Services
- The visible line where color-treated hair meets uncolored new growth.
- Demi-permanent colorHaircoloring
- Mixes with a low-volume developer - more durable than semi.
- DensityClient Consultation and Hair and Skin Analysis
- The number of individual strands per square inch of scalp.
- Depilatory over-exposureHair Removal
- Leaving it on longer than directed causes irritation or a chemical burn.
- Dermal papillaHair Removal
- The cone-shaped projection at the follicle base containing capillaries and nerves.
- Dermal papillaeFacial Anatomy
- Finger-like projections of the papillary dermis that protrude up into the epidermis.
- Dermal sheathHair and Follicle Biology
- The connective tissue sheath surrounding the hair follicle.
- DermaplaningTreatments, Modalities, and Technique
- Blade exfoliation; contraindicated with active inflamed acne, rosacea, or sensitized skin.
- DermatologySkin Structure and Physiology
- The scientific study of the skin and its disorders.
- DermisHair and Follicle Biology
- The skin layer containing collagen, elastin, blood vessels, and nerves (beneath the epidermis).
- Design carvingMen's Cuts and Styles
- A graphic design shaved into the hair using a trimmer or carving tool, freehand or with a stencil.
- DesincrustationSkin Care
- Galvanic current with an alkaline solution to soften and emulsify sebum and keratinous debris in the follicle.
- DesquamationAnatomy, Physiology, and Skin Science
- The normal shedding of dead stratum corneum cells from the skin surface.
- Deva cutHaircutting
- Cutting each curl individually while dry, in its natural curl state.
- DevaCutHaircutting and Design
- Cutting dry, working with the natural curl pattern rather than against it.
- Developer volumeHaircoloring
- Volume is the amount of oxygen gas released - 20 Vol releases 20 times its own volume.
- Development (color processing)Haircoloring
- The period during which color molecules oxidize and enlarge inside the cortex to reach final color.
- DFSFacial Hair and Shaving
- A close, comfortable shave - the traditional benchmark.
- Digital permChemical Texture Services
- Heated rods at digitally controlled temperatures mold the curl pattern.
- Direct currentElectrical Science
- Current flowing continuously in one direction without reversing.
- Direct transmissionSafety and Infection Control
- Person-to-person spread by direct contact (e.g., touching an infected sore).
- Disconnected haircutMen's Cuts and Styles
- Two zones of different lengths with no blended transition between them.
- Disconnected undercutHaircutting and Design
- No blending between lengths - a visible line of demarcation.
- DisconnectionHaircutting
- An intentional lack of blending - a visible contrast of length or texture between sections.
- DisinfectionConsultation, Analysis, and Safety
- Destroying most pathogenic microorganisms on non-living surfaces - but not necessarily bacterial spores.
- Disulfide (cystine) bondsChemical Texture Services
- Permanent waving chemically breaks and then reforms these bonds.
- Disulfide bondHair Biology and Removal Science
- The strongest chemical bond in the hair cortex, responsible for the hair's natural curl pattern and targeted by permanent wave and relaxer chemistry.
- Disulfide bondsChemical Texture Services
- The strong side bonds broken and reformed by chemical texture services.
- Double flat wrapChemical Texture Services
- One end paper on top of the subsection and a second underneath the ends.
- Double glovingInfection Control and Regulation
- Wearing two glove layers so the outer pair can be changed quickly when contaminated.
- Double process colorHaircoloring
- A two-step service: pre-lighten (bleach) first, then tone in a separate step.
- Drop crownMen's Cuts and Styles
- The crown area left slightly longer than the surrounding sections.
- Dry beadChemistry of Nail Products
- A bead with a low monomer-to-polymer ratio - stiffer and less workable.
- Dry cutCutting Technique
- Cutting curly hair dry so shrinkage is visible as you work.
- DustingCutting Technique
- Removing only the very tips of damaged ends to refresh the cut without changing length.
- Duty cycleElectrical Science
- The ratio of operating time to rest time, preventing overheating during long sessions.
E41 terms
- E-file grit on naturalManicure, Pedicure, and Nail Art
- Natural nail work requires approximately 240+ grit (fine); coarser grits damage the thin plate.
- EcchymosisClient Assessment and Complications
- Bruising from blood leaking out of damaged capillaries into surrounding tissue.
- EczemaSkin Analysis, Disorders, and Lesions
- A chronic inflammatory skin condition characterized by recurring episodes of intense itching and dry, thickened skin, often beginning in childhood.
- Effective concentrationChemistry, Ingredients, and Formulation
- The concentration at which an active ingredient actually produces its therapeutic or cosmetic effect.
- Efficacy spectrumInfection Control and Safety
- The range of microorganisms a product kills at its labeled concentration and contact time.
- EffleurageSkin Care
- Light, continuous, flowing gliding strokes, typically used to begin and end a massage.
- Effleurage directionManicure, Pedicure, and Nail Art
- On the calf, effleurage strokes move from ankle toward the knee.
- ElasticityClient Consultation and Hair and Skin Analysis
- Hair's ability to stretch and return to its original length - an indicator of cortex integrity.
- ElastinSkin Structure and Physiology
- The protein in the dermis that gives skin its flexibility and ability to return to its original shape.
- ElectrodeEquipment and Technique
- A conductor through which current enters or leaves a medium such as the body.
- ElectrolysisThe Three Modalities
- Technically the Galvanic method specifically - DC-driven chemical decomposition in the follicle.
- ElevationHaircutting
- The angle at which hair is held away from the head before cutting; 0° creates maximum weight.
- EmollientSkin, Products, and Safety
- Softens and smooths skin by forming a protective film on the surface.
- EmulsificationHair and Product Chemistry
- Combining two immiscible phases (oil and water) with an emulsifier to create a stable mixture.
- EmulsifierChemistry, Ingredients, and Formulation
- The ingredient that lets oil and water mix by reducing surface tension between them.
- EmulsionChemistry, Ingredients, and Formulation
- A mixture of two immiscible liquids (typically oil and water) combined using an emulsifier.
- End paperChemical Texture Services
- Wrapped around the hair ends to hold them smooth and flat while winding, preventing fish-hooks.
- Endocrine systemSkin Structure and Physiology
- The system of glands that secretes hormones directly into the bloodstream.
- Engineering controlsInfection Control and Regulation
- Physical devices that isolate or remove the exposure hazard (e.g., sharps containers).
- EPAInfection Control and Regulation
- Environmental Protection Agency - registers the disinfectants used on salon implements.
- EPA-registered disinfectantSkin, Products, and Safety
- A product evaluated and registered by the EPA for its stated disinfection claims.
- EphelisSkin Analysis, Disorders, and Lesions
- The technical term for a freckle.
- EpicraniusSkin Structure and Physiology
- The broad, flat muscle that covers the top and sides of the skull and is divided into the frontalis and occipitalis.
- EpigeneticsSkin Structure and Physiology
- Environmental factors (UV, diet, stress, pollution) modifying gene expression without altering the DNA sequence.
- EpilationEquipment and Technique
- Removal of the treated hair from the follicle with forceps after current application.
- EpilatorEquipment and Technique
- The device delivering electrical current through the probe to the follicle.
- Epithelial tissueSkin Structure and Physiology
- Tissue that covers body surfaces, lines internal cavities, and forms glands.
- EponychiumClient Consultation and Hair, Skin, and Nail Analysis
- The living skin at the base of the nail plate that frames the lunula and seals it.
- ErythemaClient Conditions and Outcomes
- Redness from dilation and increased blood flow in the superficial capillaries.
- Ethyl methacrylateChemistry of Nail Products
- The professional-standard monomer: lower sensitization rate, flexible, approved for professional use.
- EtiologySkin Analysis, Disorders, and Lesions
- The study of the causes of diseases.
- Eumelanin & pheomelaninHaircoloring
- The two forms of melanin determining natural hair color.
- European facial sequenceSkin Care and Facial Treatment
- Cleanse → exfoliate → steam → massage → extractions → mask → tone → moisturize.
- Evaporation rateChemistry of Nail Products
- How fast a solvent evaporates - determines how long a product stays workable.
- Exothermic reactionChemistry of Nail Products
- A reaction releasing heat, which can be felt during processing.
- Exposure incidentInfection Control and Regulation
- Specific contact of eyes, mouth, non-intact skin, or a skin penetration with blood or OPIM.
- Extension removalLash and Brow Services
- Removed with a professional solvent - never pulled off.
- Extension weightLash and Brow Services
- An extension too heavy for the natural lash damages it through weight and tension.
- Extrinsic vs. intrinsic agingSkin Structure and Physiology
- Extrinsic (photoaging) is UV-driven, with hyperpigmentation and coarse wrinkling; intrinsic is chronological.
- Eye contour skinLash and Brow Services
- Thinner and more delicate than the rest of the facial skin.
- Eyebrow reference pointsEyelash and Eyebrow
- The three design points: inner start (corner), arch (highest point), and outer end.
F39 terms
- Facial nerveSkin Structure and Physiology
- Controls the muscles of facial expression that the esthetician works over during massage.
- Fade bladeImplements and Equipment
- A clipper blade cutting closer to the skin than standard, for tight blends near the skin line.
- Fashion colors / directColor and Chemical Services
- Deposit on the cuticle without requiring developer, applied to pre-lightened hair.
- FemurNail Anatomy and Physiology
- The bone of the thigh.
- FibroblastsAnatomy, Physiology, and Skin Science
- Dermal cells that synthesize collagen, elastin, and matrix proteins.
- FillSkin and Nail Services
- Applying enhancement product only to the new growth at the matrix end.
- FillingHaircoloring
- Replacing the warm underlying pigment in over-lightened hair before going darker, so the target color looks natural.
- Film-forming polymerHair and Product Chemistry
- Polymers that deposit as a continuous film on the hair when the carrier evaporates.
- Finger pull testHaircutting
- Pulling adjacent sections between the fingers to the same point to check the cut is even.
- First in, first outInfection Control and Safety
- Products are used in the order they were purchased.
- First passShaving
- The opening pass follows hair growth because it removes hair with the least skin irritation.
- FissureSkin Analysis, Disorders, and Lesions
- A crack in the skin extending through the epidermis and sometimes into the dermis.
- Fitzpatrick classificationInfection Control and Regulation
- Categorizes skin by its UV response, Type I (always burns) to Type VI (never burns, deeply pigmented).
- Fitzpatrick donut signClient Assessment and Complications
- A ring of darker pigmentation around a procedure site - post-inflammatory hyperpigmentation at the wound margin.
- Fitzpatrick scaleClient Consultation and Analysis
- Classifies skin by its response to UV - how readily it burns versus tans.
- Fitzpatrick type and PIHSkin Analysis, Disorders, and Lesions
- Higher Fitzpatrick types carry elevated risk of post-inflammatory hyperpigmentation from peels.
- Five-point cutMen's Cuts and Styles
- A classic geometric cut with engineered points and angles that fell into shape without setting.
- Flash pointChemistry of Nail Products
- The temperature at which a product's vapors can ignite; a very low flash point means extremely flammable.
- Flash techniqueThe Three Modalities
- Very high current intensity applied for an extremely brief fraction of a second per follicle.
- Float testConsultation, Analysis, and Safety
- A clean dry strand placed in room-temperature water: low porosity floats, high porosity sinks.
- FollicleClient Consultation and Hair, Skin, and Nail Analysis
- The structure that opens to the skin surface and from which a hair grows.
- FolliculitisHair and Scalp Science
- Inflammation of the hair follicle, usually from bacterial infection or irritation.
- FomiteSafety and Infection Control
- An inanimate object - comb, towel, implement - that can transfer infection.
- FootswitchNeedles, Machines, and Equipment
- Starts and stops the machine without the dominant hand leaving the grip.
- 'Formaldehyde-free' keratin cautionChemical Texture Services
- Many such formulas still contain formaldehyde-releasing compounds (e.g., glyoxylic acid, methylene glycol).
- Formalin 'dry sanitizer' cabinetSafety and Infection Control
- Unacceptable: it fails to disinfect implements and exposes workers to hazardous vapor.
- Foundation shade testingMakeup
- Tested along the jawline, in natural daylight.
- Four razor positionsShaving
- The four standard razor holds/strokes used in shaving: freehand, backhand, reverse freehand, and reverse backhand.
- Fractional photothermolysisTreatments, Modalities, and Technique
- Tiny columns of thermal injury (microthermal zones) surrounded by untreated tissue, speeding healing.
- Fragilitas criniumHair and Scalp Science
- Brittle hair that splits or breaks easily along the shaft.
- Free edgeClient Consultation and Hair, Skin, and Nail Analysis
- The portion of the nail plate extending beyond the fingertip, not attached to the bed.
- Freehand cuttingHaircutting and Design
- Cutting without any guideline or section held by the comb.
- Freehand strokeShaving
- The most-used, basic shaving stroke - the default razor position.
- FrictionManicure, Pedicure, and Nail Art
- Deep circular or transverse rubbing that increases local circulation and breaks up adhesions.
- Front-to-back sectioningCutting Technique
- Beginning at the front hairline and working backward, often to build weight at the back.
- Frontal boneSkin Structure and Physiology
- The bone of the forehead.
- FrostingTreatments, Modalities, and Technique
- The white precipitate appearing as proteins coagulate during a peel - an endpoint indicator.
- Full cap wrap patternChemical Texture Services
- Distributes rods without directional bias, versus a standard nine-section wrap.
- FungiInfection Control, Regulation, and Practice
- Plant-like microorganisms that include molds, mildews, and yeasts.
G23 terms
- Galvanic desincrustationSkin Care and Facial Treatment
- Galvanic current with an alkaline solution softens and emulsifies sebum for easier extraction.
- GalvanismThe Three Modalities
- The production of chemical changes by passing direct current through a solution or tissue.
- GaugeNeedles, Machines, and Equipment
- The diameter of the needle wire.
- Gel pads / tapeLash and Brow Services
- Placed to isolate the lower lashes and protect the skin.
- Ghost phasePigment, Color Theory, and Healing
- Days 3 - 10 of healing, when the color appears to fade or disappear as new epidermis forms over the pigment.
- GHS 'DANGER' signal wordHair and Product Chemistry
- Marks the more severe hazard category; DANGER products require more stringent handling than WARNING.
- GlabellaFacial Anatomy
- The smooth, midline forehead area between the eyebrows.
- Gliding (sliding) strokeShaving
- A stroke that cuts whiskers smoothly with less pull than a straight push stroke.
- Glogau scaleClient Assessment and Complications
- Classifies degree of photodamage and aging, Type I (no wrinkles) to Type IV (severe).
- Gloss / glazeHaircoloring
- A demi-permanent service with low developer, used to refresh tone and add shine.
- Glyceryl monothioglycolate (GMTG)Chemical Texture Services
- Active ingredient in acid-balanced (acid) perms; requires added heat to process.
- Gold probeEquipment and Technique
- More flexible and corrosion-resistant than stainless steel, for improved comfort.
- Golden ratioTechniques and Design
- A proportional relationship applied to brow design and facial aesthetics.
- GraduationHaircutting
- A build-up of weight from cutting at low elevation - the underneath hair is shorter than the layers above.
- GrainShaving
- The direction in which the beard hairs lie, found by feeling which way they run. Passes go with it, then across, then against it.
- Green correctorMakeup
- Neutralizes facial redness, applied under foundation.
- Green hair from chlorineHaircoloring
- Oxidized copper deposits combine with ash/blue-green tones in the hair.
- GripNeedles, Machines, and Equipment
- The connecting interface between the machine's needle drive and the needle cartridge.
- GritManicure, Pedicure, and Nail Art
- Abrasive files are graded by grit number; 180 - 240 suits natural nail shaping, 100 - 150 is for enhancement product.
- Guanidine hydroxideChemical Texture Services
- The active hydroxide formed in a 'no-lye' relaxer kit.
- GuidelineHaircutting
- The first section cut, which sets the length all other sections are matched to.
- Guideline (guide)Haircutting
- The first section cut, which sets the length all other sections are matched to.
H45 terms
- Hair bulbClient Consultation and Hair, Skin, and Nail Analysis
- The swelling at the base of the hair root that encases the dermal papilla and is the site of active hair production.
- Hair densityHair and Follicle Biology
- The number of hairs growing per square centimeter of skin.
- Hair follicleHair Biology and Removal Science
- The tube-like structure in the skin from which the hair grows.
- Hair growth cycleHair Removal
- Anagen (growth) → catagen (transition) → telogen (rest), in that order.
- Hair matrixHair Biology and Removal Science
- The hair follicle structure that produces the cells that form the hair shaft.
- Hair memoryHair Science and Structure
- Hair's tendency to return to its natural wave pattern, as hydrogen and salt bonds reform in their natural configuration when exposed to moisture.
- Hair rootHair Biology and Removal Science
- The portion of the hair enclosed within the follicle beneath the skin surface.
- Hair shaftHair Biology and Removal Science
- The visible portion of the hair that projects above the skin surface.
- Hair streamClient Consultation and Hair, Skin, and Nail Analysis
- Hair flowing in the same direction across an area of the scalp.
- Hair textureHair and Follicle Biology
- The diameter of an individual strand - fine, medium, or coarse.
- Hair typingConsultation, Analysis, and Safety
- Classifying hair by wave/curl pattern, texture, density, and porosity.
- Hard waxHair Removal
- Sets and is removed without a strip; preferred for the face and bikini area.
- HBV surface survivalInfection Control and Regulation
- Hepatitis B can survive on surfaces up to a week, making contaminated probes a real transmission risk.
- Head-shave aftercareShaving
- Advise sunscreen on the scalp whenever the client is outdoors.
- Healed resultPigment, Color Theory, and Healing
- The true color and appearance of the pigment, visible only after complete skin healing.
- HemidesmosomesFacial Anatomy
- Structures anchoring basal keratinocytes to the basement membrane.
- Herd immunityInfection Control, Regulation, and Practice
- When enough of a population is immune, transmission slows and the vulnerable are indirectly protected.
- Herpes simplexInfection Control, Regulation, and Practice
- The viral infection that causes cold sores and fever blisters around the mouth.
- High porosity implicationsHair Structure and Disorders
- Highly porous hair processes faster and may need shorter timing or a weaker formula.
- High taperFades, Tapers, and Necklines
- The fade transition sits above the temple area.
- High-and-tightMen's Cuts and Styles
- Very short sides (often skin) with a slightly longer but still short top.
- Higher gauge numberNeedles, Machines, and Equipment
- A thinner needle - smaller puncture, finer detail.
- HirsutismClient Conditions and Outcomes
- Excessive facial or body hair in women following a male distribution pattern.
- Histamine reactionClient Conditions and Outcomes
- Localized hives during treatment - stop, cool compress, assess severity.
- Hit forceNeedles, Machines, and Equipment
- How hard the needle strikes the skin each cycle - a product of machine speed, stroke length, and spring.
- Hit rateNeedles, Machines, and Equipment
- How many times per second the needle strikes - controls pigment saturation per pass.
- Hollow-ground razorShaving
- A blade ground concave (hollowed out) so it is lighter and keener (sharper).
- HoningShaving
- Grinding a fresh, new edge onto a dull razor, using a hone (whetstone).
- Horseshoe sectionHaircutting
- A U-shaped top section containing crown and top, separated from the perimeter/sides/nape.
- Hospital-grade disinfectantSafety and Infection Control
- An EPA efficacy class for disinfectants proven effective against pathogenic and nonpathogenic organisms, used on salon implements and surfaces.
- Hot rootColor and Chemical Services
- A band of lighter color at the scalp, caused by applying color too close where body heat accelerates processing.
- Hot rootsHaircoloring
- When the roots appear warmer or lighter than the mid-lengths and ends.
- Hot towel timingShaving
- A pre-shave hot towel is left on until it cools toward skin temperature.
- Hot-lather machineShaving
- Dispenses warm lather, adding comfort and softening the hair.
- HumerusNail Anatomy and Physiology
- The bone of the upper arm.
- Hyaluronic acidChemistry, Ingredients, and Formulation
- A powerful humectant capable of holding many times its weight in water.
- Hydrogen bondHair Biology and Removal Science
- The type of bond in the hair cortex that is temporarily broken by water and re-formed on drying, making it responsible for wet-setting and blow-dry styling.
- HydrotherapyTreatments, Modalities, and Technique
- Therapeutic use of water in various forms (baths, jets, showers, steam).
- Hygral fatigueHair Science and Structure
- Cumulative damage from the repeated swelling (wet) and shrinking (dry) cycle.
- Hyper-elevationCutting Technique
- Produces longer lengths on top and shorter underneath, inverting the natural fall effect.
- HyperhidrosisSkin, Products, and Safety
- Excessive sweating beyond what thermoregulation requires.
- HypertrichosisClient Conditions and Outcomes
- Excessive hair growth in areas where hair does not normally grow, regardless of hormonal pattern.
- HypoallergenicInfection Control, Regulation, and Practice
- A marketing term with no standardized regulatory definition.
- HyponychiumClient Consultation and Hair, Skin, and Nail Analysis
- The skin under the free edge that seals the nail plate to the fingertip.
- HypopigmentationClient Conditions and Outcomes
- Insufficient melanin production causing lighter patches.
I23 terms
- ImmunityInfection Control, Regulation, and Practice
- The body's ability to destroy or resist infectious agents that have entered it.
- ImpetigoSkin Analysis, Disorders, and Lesions
- A highly contagious bacterial skin infection, usually Staphylococcus aureus or Streptococcus pyogenes.
- Inactive ('other') ingredientsChemistry, Products, and Practice
- Preservatives, fragrance, colorants, and texture agents.
- INCI / 'aqua'Infection Control, Regulation, and Practice
- INCI labeling requires Latin or systematic ingredient names, so water appears as 'aqua'.
- Indifferent electrodeEquipment and Technique
- The electrode the client holds, completing the circuit without producing a treatment effect.
- Indirect transmissionSafety and Infection Control
- Spread through a contaminated object or surface (e.g., a shared brush).
- Infection control complianceInfection Control, Regulation, and Practice
- The esthetician's most important contribution to public health in their daily practice.
- Infectious doseInfection Control and Regulation
- The minimum quantity of an agent required to establish infection in a susceptible host.
- Informed consentChemistry, Products, and Practice
- The cosmetologist explains the service, risks, and cost; the client understands and agrees.
- Informed refusalInfection Control, Regulation, and Practice
- When a client declines a recommendation: document the refusal and the information given, and modify to the safest option.
- Infraorbital nerveFacial Anatomy
- Provides sensory innervation to the upper lip, lower eyelid, and cheek.
- InfundibulumHair and Follicle Biology
- The portion of the follicle from the skin surface down to the sebaceous gland attachment.
- Ingrown hairHair Removal
- Forms when a regrowing hair turns back into the skin instead of breaking through.
- Ingrown hair causeHair Removal
- Dead cells block the follicle as the hair regrows.
- Ingrown hair preventionHair Removal
- Gentle exfoliation between visits keeps follicles clear.
- Inhibition layerNail Care
- The oxygen-inhibited tacky surface layer left on cured gel, wiped off with cleanser.
- InitiatorNail Care
- The ingredient in acrylic polymer powder that starts the hardening (polymerization) reaction.
- Insulated probeEquipment and Technique
- Concentrates the treatment effect at the uninsulated tip while protecting the upper follicle.
- InsulatorElectrical Science
- A material that resists the flow of electrical current.
- Integumentary systemAnatomy, Physiology, and Skin Science
- The skin and its appendages - hair, nails, and associated glands.
- InteriorHaircutting
- The layers above the perimeter weight line, which create movement and shape.
- IontophoresisThe Three Modalities
- Using direct current to drive ions of a solution into the skin for therapeutic purposes.
- Isotretinoin screeningClient Consultation and Analysis
- Recent oral isotretinoin contraindicates waxing and resurfacing - the skin is fragile and tears.
J2 terms
- Jessner's solutionChemistry, Ingredients, and Formulation
- A combination peel of resorcinol, lactic acid, and salicylic acid in an ethanol base.
- Jugular veinsAnatomy, Physiology, and Skin Science
- Drain deoxygenated blood from the head and neck back to the heart.
K8 terms
- KeloidClient Conditions and Outcomes
- An elevated, irregularly shaped scar that extends beyond the original wound boundary.
- Keloid vs. hypertrophic scarSkin Analysis, Disorders, and Lesions
- A keloid extends beyond the original wound boundary and does not regress; hypertrophic stays within it.
- KeratinSkin Structure and Physiology
- The fibrous protein that gives the epidermis its protective and waterproofing qualities.
- Keratin bond vs. micro-ringTextured Hair, Extensions, and Styling
- Keratin bonds attach with heat; micro-rings attach mechanically.
- Keratin service vs. relaxerChemical Texture Services
- Keratin smoothing is temporary; a hydroxide relaxer is permanent.
- KeratinizationHair Science and Structure
- Cells progressively fill with keratin and lose their nuclei as they move up from the matrix - living cells become hardened dead hair.
- KilowattElectrical Science
- One thousand watts.
L32 terms
- Lactic acidChemistry, Ingredients, and Formulation
- An AHA with humectant properties as well as exfoliating action - good for dry skin.
- Langer's linesFacial Anatomy
- Lines reflecting the predominant direction of collagen fiber orientation in the dermis.
- Langerhans cellsSkin Structure and Physiology
- Epidermal immune sentinel cells that detect allergens and antigens.
- LanthionizationChemical Texture Services
- The chemical process by which hydroxide relaxers permanently straighten hair.
- Lash curlEyelash and Eyebrow
- C curl = a more dramatic upward curve for an open-eye look; J curl = a gentler, natural lift.
- Lash enhancementTechniques and Design
- Implanting pigment between and along the base of the lash line.
- Lash isolationLash and Brow Services
- Each extension is attached to one isolated natural lash at a time.
- Lash lift vs. extensionsLash and Brow Services
- A lift curls and sets the client's own natural lashes; extensions add new fibers.
- Lash sealantLash and Brow Services
- Protects the adhesive bond and extends retention.
- Lateral malleolusNail Anatomy and Physiology
- The distal end of the fibula - the outer ankle bump.
- Lateral nail foldsClient Consultation and Nail Analysis
- The folds of skin along the two sides of the nail plate.
- Lather brushing motionShaving
- Lather is worked into the beard with a rotary, circular brushing motion.
- Law of colorHaircoloring
- Complementary colors - those opposite on the color wheel - cancel each other to a neutral tone.
- Leave-on vs. rinse-off AHASkin Care and Facial Treatment
- Leave-on products have sustained contact time, so they penetrate more and act more strongly.
- LentigineSkin Analysis, Disorders, and Lesions
- A flat, brown hyperpigmented spot that does not fade with reduced sun exposure, commonly seen on aging skin.
- LeukonychiaNail Disorders and Conditions
- White spots on the plate from minor matrix trauma - a serviceable condition.
- LevelHaircoloring
- The lightness or darkness of a color on a 1 (black) to 10 (lightest blonde) scale, independent of tone.
- LichenificationSkin Analysis, Disorders, and Lesions
- Thickening and hardening of skin with accentuated markings from chronic rubbing or scratching.
- Lift-off at stroke endShaving
- At the end of each stroke the blade is lifted off cleanly and reset.
- 'Like dissolves like'Chemistry, Products, and Practice
- A principle predicting that an oil dissolves most readily in another oil or nonpolar solvent.
- Lip blushTechniques and Design
- A technique depositing a sheer, buildable layer of pigment across the whole lip.
- LobHaircutting
- A bob falling between the chin and the collarbone.
- LOC methodTextured Hair, Extensions, and Styling
- Leave-in conditioner, Oil, then Cream - applied in that order to lock in moisture.
- Local infectionConsultation, Analysis, and Safety
- An infection confined to one specific area of the body.
- LoupeEquipment and Technique
- A magnifying lens worn by the electrologist, typically 2 - 5× magnification.
- Low / mid /Haircutting and Design
- The classifications differ by where on the head the fade begins.
- Low taperFades, Tapers, and Necklines
- The fade transition stays below ear level.
- Low-frequency ultrasonicTreatments, Modalities, and Technique
- Mechanical vibration that loosens surface debris and enhances product penetration.
- Lunchtime peelTreatments, Modalities, and Technique
- A very superficial peel with minimal downtime, giving visible results over a series.
- LunulaClient Consultation and Hair, Skin, and Nail Analysis
- The whitish half-moon at the base of the plate - the visible portion of the matrix.
- Lye reactionThe Three Modalities
- The Galvanic chemical decomposition that produces sodium hydroxide (lye), destroying the dermal papilla.
- Lymphatic systemAnatomy, Physiology, and Skin Science
- Removes waste and excess interstitial fluid, supports immunity, and is stimulated by massage.
M42 terms
- MaculeSkin Analysis, Disorders, and Lesions
- A primary lesion that is a flat, discolored spot on the skin surface with no change in texture or thickness.
- Macule vs. papuleClient Consultation and Hair and Skin Analysis
- Macule = flat discoloration; papule = raised, solid lesion with no fluid.
- Magnum: flat vs. curvedNeedles, Machines, and Equipment
- Shading configurations; curved (stacked) magnums have a slight arc that better conforms to the skin's contour.
- MandibleSkin Structure and Physiology
- The lower jawbone.
- MantleNail Anatomy and Physiology
- The deep fold of skin that covers the nail root.
- MatrixNail Anatomy and Physiology
- The actively growing part of the nail; damage here can permanently alter nail growth.
- Mechanical (physical) exfoliationSkin Care
- Removing dead skin by physical abrasion (e.g., a sugar or salt scrub).
- Mechanical exfoliationSkin Care
- Removing dead skin by physical abrasion (e.g., a granular scrub), vs. chemical exfoliation.
- Medial malleolusNail Anatomy and Physiology
- The distal end of the tibia - the inner ankle bump.
- MedullaClient Consultation and Hair, Skin, and Nail Analysis
- The innermost layer of the hair shaft, sometimes absent in fine or light-colored hair.
- MelaninSkin Structure and Physiology
- The pigment that gives skin and hair their color.
- Melanocyte-to-keratinocyte ratioSkin Structure and Physiology
- Each melanocyte supplies melanin to roughly 36 surrounding keratinocytes via its dendrites.
- MelanocytesSkin Structure and Physiology
- The cells in the basal layer that produce the pigment responsible for skin color.
- MelanonychiaNail Disorders and Conditions
- Dark longitudinal streaks in the plate; requires medical evaluation to rule out subungual melanoma.
- MelasmaHair Structure and Disorders
- Hormonally influenced symmetric hyperpigmentation on the face.
- Menopausal skin changeSkin Structure and Physiology
- Declining estrogen reduces collagen synthesis, sebaceous and sweat activity, and hyaluronic acid.
- Menthol aftershaveShaving
- Valued mainly for its cooling, refreshing sensation.
- MetamerismMakeup
- The color theory principle that explains why the same red lip product appears more intense under warm tungsten lighting than under cool daylight.
- Methacrylate allergyNail Enhancement Services
- A contraindication to acrylic services, since EMA is itself a methacrylate.
- Micro-link (I-tip) extensionsTextured Hair, Extensions, and Styling
- Metal rings crimped around the natural hair and the extension.
- MicrocurrentTreatments, Modalities, and Technique
- Sub-sensory electrical stimulation mimicking the body's natural bioelectrical impulses.
- MicrodermabrasionTreatments, Modalities, and Technique
- Mechanical abrasion of the stratum corneum using a diamond tip or crystals with vacuum suction.
- Mid taperFades, Tapers, and Necklines
- The fade transition sits at ear level.
- Mild vs. aggressive safetyImplements and Equipment
- How much blade is exposed relative to the guard.
- MiliaSkin Analysis, Disorders, and Lesions
- Small hard white cysts of keratin trapped beneath the epidermis, often around eyes and cheeks.
- MilliampereElectrical Science
- One one-thousandth of an ampere.
- Mineral sunscreen white castChemistry, Ingredients, and Formulation
- Caused by zinc oxide or titanium dioxide sitting on the skin surface.
- Minimum hair lengthHair Removal
- Enough length is needed for the wax to grip the hair.
- Minimum infective doseInfection Control, Regulation, and Practice
- The smallest number of organisms required to establish infection in a susceptible host.
- Minor consentClient Consultation and Analysis
- A client under 18 requires parent or guardian consent before service.
- MitosisAnatomy, Physiology, and Skin Science
- Cell division producing two identical daughter cells, renewing the epidermis and producing hair.
- ModalityThe Three Modalities
- The specific method of hair removal used - Galvanic, Thermolysis, or Blend.
- Molding (shaping)Hairstyling
- Directing wet hair into its intended pattern before a wet set.
- Money pieceColor and Chemical Services
- Face-framing pieces brightened to catch the light around the face.
- MonilethrixHair Structure and Disorders
- 'Beaded hair' - a shaft with alternating nodes and periodic constrictions.
- MonoethanolamineHaircoloring
- The ammonia substitute in 'ammonia-free' color - raises pH more gently with far less odor.
- MonomerChemistry of Nail Products
- A single molecule capable of bonding with others to form a polymer.
- MRSASafety and Infection Control
- Methicillin-Resistant Staphylococcus Aureus - a bacterial infection resistant to many antibiotics.
- Muscular systemSkin Structure and Physiology
- The system that produces motion in the body through contraction.
- Muscular tissueSkin Structure and Physiology
- Tissue that contracts and produces movement.
- Mushroom cutMen's Cuts and Styles
- A rounded bowl-like perimeter, with the sides cut shorter than the top's perimeter.
- Mustache symmetryShaving
- Shaped by referencing both sides to the midline below the center of the nose.
N30 terms
- Nail bedClient Consultation and Hair, Skin, and Nail Analysis
- The structure beneath the plate that supplies nutrients and contributes to plate color.
- Nail fold systemSkin and Nail Services
- The proximal and lateral nail folds seal and protect the nail unit.
- Nail groovesClient Consultation and Hair, Skin, and Nail Analysis
- The tracks along the sides of the nail plate that guide nail growth.
- Nail plateClient Consultation and Hair, Skin, and Nail Analysis
- The visible, hardened keratin portion of the nail resting on the nail bed.
- Nail unitNail Anatomy and Physiology
- All the structures collectively required for nail growth - plate, matrix, bed, folds, and adjacent skin.
- Nano browsTechniques and Design
- Machine-created hair strokes using a single or nano needle cartridge.
- NapeFades, Tapers, and Necklines
- The back of the neck where the hairline ends.
- Nape shapesFades, Tapers, and Necklines
- Three common nape finishes, each giving a different look to the back of the neck.
- Natural falling distributionCutting Technique
- Combing the hair straight down as gravity pulls it, with no added tension.
- Natural necklineFades, Tapers, and Necklines
- Leaving the existing growth pattern uncut and unshaped at the back hairline.
- 'Natural' / 'organic'Infection Control, Regulation, and Practice
- For cosmetics, 'natural' has no FDA-regulated definition.
- Needle countNeedles, Machines, and Equipment
- The number of individual needle points grouped in a cartridge configuration (the number in 3RL, 5RS).
- Needle depthNeedles, Machines, and Equipment
- How far the needle tip extends beyond the cartridge tip during the down-stroke.
- Negative spaceTechniques and Design
- The empty space in and around the brow design that shapes how it reads.
- Nerve tissueSkin Structure and Physiology
- Tissue that carries messages to and from the brain and controls body functions.
- Nervous systemSkin Structure and Physiology
- The system that controls and coordinates body activity through electrical impulses.
- Neutral / natural toneHaircoloring
- A tone balancing warmth and coolness for a natural-looking result.
- NeutralizerChemical Texture Services
- An oxidizing agent that converts reduced sulfhydryl (-SH) groups back into disulfide bonds, locking in the new shape.
- NevusSkin Analysis, Disorders, and Lesions
- A pigmented, raised growth on the skin that may be flat or elevated and is composed of melanocytes.
- New growthHaircoloring
- The virgin hair grown in between the previously treated hair and the scalp.
- NiacinamideChemistry, Ingredients, and Formulation
- Improves barrier function, reduces redness, and addresses mild hyperpigmentation.
- No double-dippingHair Removal
- A fresh, clean spatula every time - never return a used spatula to the pot.
- No-double-dip ruleNail Enhancement Services
- A used nail is never re-dipped into the shared powder container.
- No-lye relaxerChemical Texture Services
- A relaxer using calcium hydroxide plus an activator instead of sodium hydroxide; milder on scalp.
- No-lye relaxer chemistryChemical Texture Services
- Calcium hydroxide with an activator; a lower pH, gentler on the scalp.
- Non-acetone solventsChemistry of Nail Products
- Ethyl acetate, isopropyl alcohol, or propylene carbonate - gentler but less effective than acetone.
- Non-comedogenicInfection Control, Regulation, and Practice
- Formulated to minimize the likelihood of clogging follicles - an industry term, not a guarantee.
- Normal growth rateHair Science and Structure
- About 1.25 cm (roughly half an inch) per month.
- Nosocomial infectionInfection Control and Regulation
- A healthcare-associated infection acquired as a result of a procedure or healthcare contact.
- NucleusSkin Structure and Physiology
- The part of the cell that controls reproduction and other cellular activities.
O33 terms
- O-ringNeedles, Machines, and Equipment
- A rubber seal that prevents pigment and fluids from leaking back into the machine.
- OccipitofrontalisAnatomy, Physiology, and Skin Science
- A two-bellied scalp muscle: the frontalis raises the brows, the occipitalis draws the scalp back.
- OcclusivesChemistry, Ingredients, and Formulation
- Ingredients forming a semi-occlusive film on the stratum corneum, physically reducing TEWL.
- Occupational exposureInfection Control and Regulation
- Reasonably anticipated skin, eye, mucous membrane, or parenteral contact with blood or OPIM from performing one's duties.
- Ohm's lawElectrical Science
- Current equals voltage divided by resistance (I = V/R).
- OlecranonNail Anatomy and Physiology
- The bony prominence of the elbow.
- OmbréManicure, Pedicure, and Nail Art
- Blending two or more colors, often with a sponge, to create a gradual fade.
- Ombré (gradient)Nail Care
- A gradual color fade from one shade to another across the nail.
- Once-over shaveShaving
- A shave made with a single pass, going with the grain - as opposed to a close shave, which uses multiple passes.
- OnychauxisClient Consultation and Hair, Skin, and Nail Analysis
- Abnormal thickening of the nail plate (trauma or systemic causes).
- OnycholysisClient Consultation and Hair, Skin, and Nail Analysis
- Separation/loosening of the nail plate from the nail bed.
- OnychomadesisClient Consultation and Nail Analysis
- Complete shedding or falling-off of the whole nail plate, sometimes after illness or injury.
- OnychomycosisClient Consultation and Nail Analysis
- A fungal nail infection, primarily caused by dermatophytes such as Trichophyton rubrum.
- OnychophagiaClient Consultation and Hair, Skin, and Nail Analysis
- Nail biting that damages the nail plate and surrounding skin.
- OnychoschiziaClient Consultation and Hair, Skin, and Nail Analysis
- Layered splitting or peeling of the nail plate at the free edge.
- Open circuitElectrical Science
- The circuit path is broken, so no current flows to the follicle.
- Open comedoneSkin Analysis, Disorders, and Lesions
- A non-inflamed acne lesion formed by a plugged follicle open at the surface, appearing as a dark spot.
- OPIMInfection Control and Regulation
- Under OSHA BBP: semen, vaginal secretions, cerebrospinal and synovial fluid, and any fluid visibly contaminated with blood.
- Orbicularis oculiAnatomy, Physiology, and Skin Science
- The ring-shaped muscle that closes the eye.
- Orbicularis orisSkin Structure and Physiology
- The ring-shaped muscle that closes and puckers the mouth.
- Organic loadSkin, Products, and Safety
- Hair, skin, oil, and blood residue that must be removed before disinfection can work.
- OriginSkin Structure and Physiology
- The attachment to the bone that does not move during contraction.
- OSHAInfection Control and Regulation
- The federal agency responsible for occupational safety standards, including chemical hazard communication.
- OSHA BBP requirementsInfection Control and Regulation
- A written exposure control plan, free HBV vaccination, and training for at-risk employees.
- Outlining (edging) a beardHaircutting
- Defining the clean edges or outline of a beard or hairline.
- Over-directionHaircutting
- Combing or holding hair beyond its natural falling position before cutting, creating length increase.
- Over-processedChemical Texture Services
- Too many disulfide bonds broken, producing weak, limp, frizzy, or 'fish-hook' waves.
- Over-treatmentClient Conditions and Outcomes
- Excessive tissue destruction causing pitting, scarring, or hyperpigmentation.
- OverlapChemical Texture Services
- Applying new relaxer over previously relaxed hair, double-processing and weakening it.
- OxidationColor and Chemical Services
- The developer reacts with dye precursors in the cortex to form the final color molecules.
- Oxidative colorHaircoloring
- Color using an oxidizing agent (H₂O₂ developer) to both lighten melanin and develop the dye.
- Oxidative couplingHaircoloring
- H₂O₂ oxidizes the primary dye intermediate, which then reacts with couplers to form the final large color molecule.
- Oxidative vs. non-oxidativeHaircoloring
- Oxidative color requires a developer; non-oxidative deposits without one.
P74 terms
- PapuleSkin Analysis, Disorders, and Lesions
- A small, solid raised lesion less than 0.5 cm in diameter with no visible fluid.
- Paraffin treatmentManicure, Pedicure, and Nail Art
- Dipping the feet (or hands) into warm paraffin several times, then wrapping to retain heat.
- ParasitesInfection Control, Regulation, and Practice
- Organisms that live on or inside another organism and draw nourishment from it.
- ParfumChemistry, Products, and Practice
- Fragrance - a complex mixture and a common allergen.
- Parietal ridgeFades, Tapers, and Necklines
- The widest area of the head, where the top and the sides meet.
- Passive diffusionChemistry, Ingredients, and Formulation
- The process by which a substance moves from an area of higher concentration to an area of lower concentration without requiring energy.
- Patch (predisposition) test timingClient Consultation and Analysis
- Performed 24 - 48 hours ahead of a tint or chemical service to screen for allergic reaction.
- Patch testClient Assessment and Complications
- Applying a small amount of the planned pigment to a discreet skin area, 24 - 48 hours ahead, to observe any reaction.
- Patch test before tintingLash and Brow Services
- Performed before any lash or brow tint to screen for allergic reaction.
- PathogenInfection Control, Regulation, and Practice
- A microorganism capable of causing disease in a susceptible host.
- Pathogenic microorganismInfection Control and Regulation
- A microorganism capable of causing disease in a susceptible host.
- Peau d'orangeClient Consultation and Analysis
- 'Orange-peel' skin - enlarged pores giving a bumpy texture.
- Pediculosis capitisSkin Analysis, Disorders, and Lesions
- Head lice infestation of the scalp hair.
- Perifollicular hypopigmentationPigment, Color Theory, and Healing
- Lighter rings around hair follicles after a procedure, caused by sparing of the skin immediately around follicles during healing.
- PerimeterHaircutting
- The outermost edge of the haircut - where the design meets skin at nape, temples, and sides.
- Perimeter guideHaircutting
- The first section cut, establishing the length all later sections are brought to.
- PerionychiumNail Anatomy and Physiology
- All the soft tissue surrounding the nail - the nail folds and adjacent skin.
- Periosteum / supraorbital rimFacial Anatomy
- The bony orbital rim serving as the inferior anatomical boundary for brow design.
- PetrissageManicure, Pedicure, and Nail Art
- Kneading and squeezing the muscle bulk (e.g., the thenar eminence) to release tension.
- pH scaleChemistry of Nail Products
- Runs 0 - 14: 7 is neutral, below 7 acidic, above 7 alkaline.
- pH-balanced cleanserSkin Care and Facial Treatment
- Adjusted to roughly pH 4.5 - 5.5, compatible with the skin's slightly acidic mantle.
- Phagocytic indexPigment, Color Theory, and Healing
- How efficiently macrophages engulf (phagocytose) pigment particles - a driver of how fast pigment fades.
- Pheomelanin vs. eumelaninSkin Structure and Physiology
- Pheomelanin is the yellow-red melanin predominant in fair, red-haired individuals; eumelanin is the brown-black form.
- PhiltrumFacial Anatomy
- The vertical groove running from the base of the nose to the upper lip's cupid's bow.
- PhotoinitiatorChemistry of Nail Products
- The ingredient that responds to specific UV/LED wavelengths to start curing.
- Physical changeChemical Texture Services
- A temporary change in shape or texture - wet setting, blow-drying, flat-ironing - reversed by water.
- Physical vs. chemical exfoliationTreatments, Modalities, and Technique
- Physical uses mechanical abrasion (scrubs, microdermabrasion, dermaplaning); chemical uses acids or enzymes.
- Pigment migrationPigment, Color Theory, and Healing
- Pigment spreading beyond the intended implantation area into surrounding tissue.
- Pin curl (three parts)Hairstyling
- The three main parts of a pin curl.
- PinchingNail Enhancement Services
- Applying gentle lateral pressure to gel sides during initial cure to refine the C-curve.
- PittingClient Conditions and Outcomes
- Small depressed scars avoided by proper insertion, appropriate intensity, and no over-treatment.
- PityriasisSkin Analysis, Disorders, and Lesions
- Abnormally dry scalp and hair with flaking not caused by fungus.
- Plantar fasciaNail Anatomy and Physiology
- A thick band of connective tissue on the sole of the foot supporting the arch.
- Platelet-rich plasmaTreatments, Modalities, and Technique
- The client's own blood is centrifuged to concentrate growth factors, then applied or injected.
- PointShaving
- The tip end of the blade.
- Point-cut / slice-cut texturizingCutting Technique
- Texturizing methods that create a messy, textured look, paired with matte styling products.
- PolarityElectrical Science
- The positive and negative directional flow of current through a circuit.
- PolymerizationChemistry of Nail Products
- Linking monomers into polymer chains - how liquid-and-powder acrylics harden.
- PolypeptideHair Science and Structure
- A chain of amino acids linked by peptide bonds - the primary structure of proteins including keratin.
- PorosityClient Consultation and Hair and Skin Analysis
- The hair's ability to absorb moisture and chemicals through the cuticle into the cortex.
- Porosity equalizationHaircoloring
- Applying a filler to porous ends before a service so color takes evenly.
- Port wine stainClient Assessment and Complications
- A vascular birthmark caused by abnormal blood-vessel development.
- Portal of entrySafety and Infection Control
- The site where a pathogen enters a new host (broken skin, eyes, mucous membranes).
- Post-inflammatory hyperpigmentationClient Consultation and Hair and Skin Analysis
- Darkening of the skin that occurs after inflammation or injury.
- Post-inflammatory hyperpigmentation (PIH)Client Consultation and Hair, Skin, and Nail Analysis
- Darkening of the skin that occurs after inflammation or injury.
- Post-service curingLash and Brow Services
- Clients avoid water, steam, and oils during the curing period.
- Post-treatment hyperpigmentationClient Conditions and Outcomes
- Darkening after treatment; more common in darker skin types and usually fades with sun protection.
- Post-wax aftercareHair Removal
- For 24 - 48 hours avoid sauna, hot baths, and sun.
- Post-wax soothingHair Removal
- A cool compress or aloe immediately after.
- Powder browTechniques and Design
- A soft, filled-in shading technique mimicking powder makeup.
- Pre-pigmentationHaircoloring
- Depositing warm pigment onto over-lightened hair before applying a darker color.
- Pre-pooSkin, Products, and Safety
- A treatment coating the hair with oil or conditioner before shampoo, reducing its drying effect.
- Pre-shave oilShaving
- Applied before lathering to lubricate the skin so the blade glides.
- Pre-softeningHaircoloring
- Applying color without developer (or a mild alkaline solution) to very resistant gray to open the cuticle first.
- Pre-wax cleansingHair Removal
- Clean, dry skin lets wax grip the hair instead of lotion or oil.
- Pre-wax powderHair Removal
- A light dusting absorbs surface moisture so wax grips hair rather than skin.
- Predisposition (patch) testHaircoloring
- Required before every aniline-derivative color service, to screen for allergic reaction.
- Premature moistureLash and Brow Services
- Water contacting fresh adhesive weakens the bond before it sets.
- PressingChemical Texture Services
- A temporary physical change: heat breaks hydrogen bonds and the comb smooths the hair straight until moisture returns.
- Preventing hot rootsHaircoloring
- Apply mid-lengths first, and use a lower volume at the roots.
- Primary colorsMakeup
- Red, yellow, and blue in traditional color theory.
- PrimerNail Enhancement Services
- Improves adhesion by bonding to both the natural plate and the enhancement product.
- Primum non nocereSkin Care and Facial Treatment
- 'First, do no harm' - prioritizing client safety over treatment intensity.
- ProbeEquipment and Technique
- The thin wire-like implement inserted into the follicle.
- Protein overloadHair Structure and Disorders
- Hair stiff and brittle with reduced elasticity from too much protein - treat by stopping protein and adding moisture.
- Pseudofolliculitis barbaeClient Conditions and Outcomes
- 'False folliculitis of the beard' - shaved hairs curl back into the skin, causing inflamed bumps; avoid a close against-the-grain shave.
- Pseudomonas aeruginosaNail Disorders and Conditions
- The bacterium that produces the green discoloration under enhancements.
- Pseudomonas color progressionNail Disorders and Conditions
- Yellow-green → blue-green → darker green or black as the infection intensifies.
- PsoriasisSkin Analysis, Disorders, and Lesions
- A chronic skin condition characterized by sharply defined, raised plaques with silvery-white scales, most commonly on the elbows, knees, and scalp.
- PterygiumClient Consultation and Hair, Skin, and Nail Analysis
- Forward overgrowth of skin across the plate; serviceable - softened and gently pushed back.
- Pterygium (nail)Client Consultation and Nail Analysis
- Abnormal forward growth of living skin onto the nail plate.
- Pulmonary circulationAnatomy, Physiology, and Skin Science
- The circuit carrying blood from the heart to the lungs for oxygenation.
- Pure substanceChemistry, Ingredients, and Formulation
- Matter that has a uniform composition throughout and cannot be separated into simpler substances by physical means.
- PustuleSkin Analysis, Disorders, and Lesions
- A primary lesion containing pus.
Q3 terms
- Quat inactivationInfection Control and Safety
- Quaternary ammonium compounds are inactivated by hard-water minerals and anionic surfactants (soaps).
- QuatsSafety and Infection Control
- Common salon disinfectants for nonporous tools and surfaces.
- Quats (quaternary ammonium compounds)Safety and Infection Control
- Common salon disinfectants for nonporous tools and surfaces.
R31 terms
- Radio frequencyThe Three Modalities
- The high-frequency alternating current used in Thermolysis, in the 1 - 30 megahertz range.
- RancidityChemistry, Ingredients, and Formulation
- Oxidative degradation of unsaturated fatty acids in oil-based products, producing off-odors.
- Razor angleShaving
- Too steep (too open) an angle raises the risk of cutting or gouging the skin.
- Razor over combHaircutting
- Using a razor over the comb to create seamless fading and blending at nape and sides.
- Re-lather before against-grainShaving
- Before an against-the-grain pass, the area is re-lathered.
- Reactive oxygen speciesSkin Structure and Physiology
- Free radicals generated by UV, pollution, and chemicals that damage cellular DNA, proteins, and lipids.
- Reasonable esthetician standardClient Consultation and Analysis
- The care expected of a competent esthetician with comparable training and experience.
- ReductionHair Science and Structure
- The gain of electrons (or addition of hydrogen); reducing agents *break* disulfide bonds in perms and relaxers.
- RegrowthClient Conditions and Outcomes
- Hair emerging from a previously treated follicle that was not permanently destroyed.
- Regrowth areaNail Enhancement Services
- The gap at the proximal end as the natural nail grows out, requiring a fill.
- Regulated medical wasteInfection Control and Regulation
- Waste requiring special handling; excludes unused, unopened sterile packaging.
- Relaxer + perm incompatibilityChemical Texture Services
- Perming previously hydroxide-relaxed hair is contraindicated; the two chemistries are incompatible.
- Relaxer overlapChemical Texture Services
- Avoided on a retouch because it weakens hair and causes breakage.
- Relaxer strengthsChemical Texture Services
- The concentration of the active alkaline ingredient - super is strongest, for the most resistant hair.
- Repeated passesHair Removal
- Waxing the same patch repeatedly in one session lifts or irritates the skin.
- Resident floraInfection Control and Regulation
- Microorganisms normally inhabiting the skin without causing disease, supporting the barrier.
- Residual activityInfection Control and Safety
- A product's ability to keep killing organisms on a surface after application and drying.
- Resistance on extractionEquipment and Technique
- Resistance when removing the hair means treatment was insufficient - retreat rather than pluck.
- Retinoid screeningClient Consultation and Analysis
- Topical retinoids thin the stratum corneum, so waxing over them risks lifting skin.
- Reverse (negative) elevationCutting Technique
- Hair pulled downward below the natural fall line, creating shorter interior lengths.
- Right to Know lawInfection Control, Regulation, and Practice
- Gives employees the right to information about the chemical hazards in their workplace.
- Right-to-KnowSkin, Products, and Safety
- Requires barbers have access to Safety Data Sheets for every chemical used in the workplace.
- Rings of fireNail Care
- Deep grooves cut into the natural nail by an e-file held at the wrong angle.
- RingwormSafety and Infection Control
- A contagious fungal infection of the skin; a contraindication because it spreads.
- Ringworm (tinea corporis)Safety and Infection Control
- A contagious fungal infection of the skin; a contraindication because it spreads.
- Rod diameterChemical Texture Services
- A smaller-diameter rod produces a tighter, smaller curl.
- Roll-on cartridge hygieneHair Removal
- A fresh, dedicated cartridge head per client.
- Root concealerColor and Chemical Services
- A temporary spray pigment covering visible regrowth, which washes out.
- RosaceaSkin Analysis, Disorders, and Lesions
- A chronic facial condition characterized by persistent redness, visible blood vessels, and possible papules or pustules, predominantly affecting the central face.
- Rule of fifthsTechniques and Design
- Divides the face horizontally into five equal vertical units, each about one eye-width.
- Rule of thirdsTechniques and Design
- Divides the face vertically into three roughly equal horizontal thirds: hairline→brow, brow→base of nose, base of nose→chin.
S96 terms
- Salicylic acidChemistry, Ingredients, and Formulation
- Oil-soluble, so it dissolves into follicular sebum and works comedolytically from inside the pore.
- Sanitary jar decantingMakeup
- Use a clean disposable spatula each time product is taken from a jar.
- SanitizationInfection Control, Regulation, and Practice
- Reducing microorganism levels to those considered safe by public health standards.
- Sanitization vs. disinfectionInfection Control and Safety
- Sanitization reduces microbial counts to safe levels; disinfection destroys most pathogens on surfaces.
- SanitizeInfection Control and Regulation
- To reduce microorganisms on a surface to a safe level per public health standards.
- SaponificationChemical Texture Services
- Alkali-induced breakdown of natural sebum and scalp oil by highly alkaline products like hydroxide relaxers.
- SaturationPigment, Color Theory, and Healing
- The density of pigment deposited in the procedure area.
- ScaleSkin Analysis, Disorders, and Lesions
- A secondary lesion consisting of dry, thin flakes of dead epidermal cells.
- Scalp mobilityClient Consultation and Hair and Skin Analysis
- How freely the scalp tissue moves over the skull when gently shifted.
- ScarSkin Analysis, Disorders, and Lesions
- Fibrous tissue that replaces normal skin after deep injury or surgery.
- Scissor-over-comb vs. clipper-over-combHaircutting and Design
- Scissor-over-comb uses shears rather than clippers, giving more control.
- Sculpted vs. natural beardFacial Hair and Shaving
- A sculpted beard has defined lines, trimmed length, and a specific shape.
- SDSSafety and Infection Control
- The current name that replaced the older term Material Safety Data Sheet (MSDS).
- SDS 'DANGER' signal wordChemistry, Products, and Practice
- Indicates a higher hazard category than 'WARNING'.
- SDS (Safety Data Sheet)Safety and Infection Control
- The current name that replaced the older term Material Safety Data Sheet (MSDS).
- Sebaceous filamentsSkin Structure and Physiology
- Normal cylindrical collections of sebum lining the follicle - not blackheads.
- Sebaceous glandsAnatomy, Physiology, and Skin Science
- Glands of the skin that secrete an oily substance to lubricate the skin and hair.
- SeborrheaSkin Analysis, Disorders, and Lesions
- Excessive sebaceous secretion producing abnormally oily skin or scalp.
- Seborrheic alopeciaConsultation, Analysis, and Safety
- Hair thinning associated with chronic seborrheic dermatitis - excess sebum and Malassezia.
- Seborrheic keratosisClient Assessment and Complications
- A benign pigmented growth; needle work should avoid it and it should be documented.
- SebumSkin Structure and Physiology
- The oily secretion of the sebaceous gland.
- Selective photothermolysisTreatments, Modalities, and Technique
- The principle behind laser and IPL hair removal: targeted chromophore absorbs light and converts it to damaging heat.
- Self-levelingChemistry of Nail Products
- A product's tendency to flow slightly under its own weight and surface tension before curing.
- Semi-permanent colorHaircoloring
- Deposits tone without a developer.
- Senescent alopeciaHair and Scalp Science
- Age-related thinning that is not androgenetic in origin.
- ShadowNail Enhancement Services
- A visible void indicating separation (lifting) between the enhancement and the nail plate.
- ShagHaircutting
- Heavy interior layers, face-framing layers, and a textured perimeter with point- or razor-cut ends.
- Shape-upFades, Tapers, and Necklines
- Cutting the forehead hairline to match the client's natural shape, softened or crisped to preference.
- Shifted distributionCutting Technique
- Combing hair away from its natural falling direction to one side, creating asymmetric length.
- ShrinkageHair and Scalp Science
- Curly hair's dry length is shorter than its stretched length - critical when cutting.
- Sideburn evennessShaving
- Checked by comparing each to a fixed point such as the bottom of the earlobe or the tragus.
- Signal peptideChemistry, Ingredients, and Formulation
- Mimics a collagen breakdown fragment, signaling fibroblasts to make new collagen.
- Signs of scalp infectionClient Consultation and Analysis
- Oozing, swelling, or other infection signs mean refer to a physician - do not service.
- Single processHaircoloring
- Color applied to the whole head in one step with one formula.
- Single-edgeImplements and Equipment
- SE razors use a blade with one cutting edge; DE blades cut on both sides.
- Single-useInfection Control and Regulation
- Items that must be discarded after one client and cannot be sterilized for reuse.
- Single-use porous itemsChemistry, Products, and Practice
- Porous items such as neck strips must be discarded after each client - reuse is a violation.
- Skeletal systemSkin Structure and Physiology
- The system that consists of bones, joints, and cartilage and provides the body's framework.
- SkinSkin Structure and Physiology
- The largest organ of the human body.
- Skin barrier functionSkin Structure and Physiology
- The stratum corneum's protective role; when compromised, TEWL rises and irritants and allergens penetrate.
- Skin fade with beardFacial Hair and Shaving
- Blending the fade down into the beard line at the temple without a visible break.
- Skin laxityClient Assessment and Complications
- Loss of elasticity; lax skin moves more and needs more precise bracing and stretching.
- Skin memoryClient Assessment and Complications
- The skin's tendency, via elastin fibers, to return to its original position after being stretched.
- Skin microbiomeSkin Structure and Physiology
- The community of commensal microorganisms on skin contributing to barrier function and immunity.
- Skin stretchEquipment and Technique
- Stretching during insertion opens and straightens the follicle for accurate probe placement.
- Skin taut during removalHair Removal
- The free hand holds the skin taut as the strip is removed.
- Skin turgorClient Assessment and Complications
- An assessment of the skin's hydration status and elasticity.
- Slick backMen's Cuts and Styles
- Longer top hair directed back with firm-hold pomade or gel and a comb.
- Smile lineNail Care
- In a French enhancement, the curved line where the white free edge meets the pink.
- SmoothingChemical Texture Services
- Using the back of a comb or gloved fingers to work product through, helping the alkali straighten the strand.
- Soap capHaircoloring
- A mix of color or lightener with shampoo, used for a gentle lift or refresh.
- Sodium hydroxide (lye) relaxerChemical Texture Services
- A strong hydroxide relaxer that straightens by breaking disulfide bonds and permanently rearranging the hair.
- Soft (strip) waxHair Removal
- Applied thinly and removed *with a strip*.
- Soft wax directionHair Removal
- Applied with hair growth, removed against it.
- Soul patchFacial Hair and Shaving
- A small patch of hair directly below the lower lip, with the rest of the face clean-shaven.
- SparkingSkin and Nail Services
- Briefly lifting the electrode to produce a spark, used in acne treatment.
- Specific gravityChemistry, Products, and Practice
- The density of a product compared with water.
- SpirillaInfection Control, Regulation, and Practice
- Spiral or corkscrew-shaped bacteria responsible for diseases such as syphilis and Lyme disease.
- Squeak testNail Enhancement Services
- Running a lint-free cloth or fingernail across the finished surface to detect lifting or residue.
- StackedHaircutting
- Nape layers that graduate - each slightly longer than the one beneath - creating visual stacking.
- Standard of careInfection Control, Regulation, and Practice
- The level of care a reasonably competent esthetician with similar training would provide.
- Standard precautionsConsultation, Analysis, and Safety
- Treating all clients as potentially infectious, using barrier precautions for all blood and body fluid contact.
- Standard PrecautionsInfection Control and Regulation
- Treating every client's blood and body fluids as potentially infectious.
- StaphylococciInfection Control, Regulation, and Practice
- Bacteria that are spherical in shape and grow in clusters resembling a bunch of grapes.
- Starter phaseTextured Hair, Extensions, and Styling
- Sections are twisted but not yet condensed or matured into firm units.
- Stationary (fixed) guidelineHaircutting and Design
- A guide that does not move; every subsequent section is brought back to it.
- Stationary guideHaircutting
- A guide that stays in one place; all sections travel to it and are cut to the same length.
- STELHair and Product Chemistry
- The maximum concentration acceptable for a 15-minute exposure, not to exceed 4 times per day.
- Stem (perm wrap)Chemical Texture Services
- The section of hair between the scalp and the first turn of the rod.
- SterilizationInfection Control and Regulation
- The highest level of decontamination, destroying all microbial life including resistant bacterial spores, usually in an autoclave.
- SternocleidomastoidSkin Structure and Physiology
- A prominent paired neck muscle that rotates and flexes the head - a landmark for neck and décolleté work.
- Still bladeImplements and Equipment
- The blade that does not move during cutting; the opposing blade moves against it.
- Straight backChemical Texture Services
- A perm loosening slightly over the first 1 - 3 weeks as remaining hydrogen bonds settle.
- Strand testChemical Texture Services
- Applying the full perm process to a hidden section to preview the result.
- Stratum corneumClient Consultation and Analysis
- The outermost epidermal layer, roughly 10 - 20 cell layers thick; superficial peels act only here.
- Stratum germinativumSkin Structure and Physiology
- The deepest, living layer of the epidermis, where new cells are produced.
- Stratum lucidumSkin Structure and Physiology
- The thin, clear layer of the epidermis found only in thick skin (palms and soles).
- StreptococciInfection Control, Regulation, and Practice
- Bacteria that grow in chains and can cause strep throat and blood poisoning.
- Stress areaNail Enhancement Services
- The zone where the enhancement bears the most stress - built with a medium-wet bead for the densest, strongest product.
- StropShaving
- A strip (leather plus a linen/canvas side) used to finish the razor's edge; the linen/canvas side cleans and warms the edge first, the leather finishes it.
- StroppingShaving
- Aligning and smoothing the razor's existing edge on a strop, done just before each shave - not grinding a new edge.
- StypticShaving
- A pencil or alum powder applied to a nick to stop bleeding.
- Subcutaneous (adipose) layerSkin Structure and Physiology
- The layer of fatty tissue beneath the dermis that provides insulation and a smooth contour.
- Subcutaneous layerClient Consultation and Hair, Skin, and Nail Analysis
- The deepest skin layer, made largely of fatty (adipose) tissue.
- SubstantivityHair and Product Chemistry
- An ingredient's ability to adsorb to the hair surface and resist rinsing off.
- Subungual hematomaClient Consultation and Nail Analysis
- A dark red-to-black bruise under the nail after the finger is pinched or struck.
- Sudoriferous glandsSkin Structure and Physiology
- Glands of the skin that excrete perspiration and help regulate body temperature.
- Sugar pasteHair Removal
- Applied against growth and removed with it - the reverse of soft wax.
- Sugar paste - practicalHair Removal
- Water-soluble, so residue rinses away.
- SugaringHair Removal
- A hair-removal method using a sticky sugar paste applied to the skin.
- Superficial temporal arteryFacial Anatomy
- A branch of the external carotid running through the temporal region lateral to the brow.
- SupinationNail Anatomy and Physiology
- Rotating the forearm so the palm faces upward.
- SurfactantChemistry, Ingredients, and Formulation
- A substance that lowers surface tension between two substances, enabling mixing or foaming.
- SurfactantsSkin, Products, and Safety
- Reduce surface tension between water and oil, enabling removal of sebum and debris.
- Symmetrical balanceHaircutting and Design
- The two sides of the design are mirror images of each other.
- Sympathetic ophthalmiaClient Assessment and Complications
- A severe autoimmune response in which trauma to one eye triggers inflammation in the other.
T69 terms
- T-zoneSkin Care
- Forehead, nose, and chin - typically oily in combination skin while cheeks stay drier.
- TangShaving
- The finger rest (bar) below the blade, where the fingers grip when shaving.
- Taper fadeFades, Tapers, and Necklines
- A fade tapering gradually from longer top lengths down to very short or skin at the sides.
- Taper lengthNeedles, Machines, and Equipment
- The length of the needle's pointed tip, from where it begins narrowing to the sharp point.
- Taper leverImplements and Equipment
- Closes the blade gap for a shorter cut and smoother fade transitions.
- Taper necklineFades, Tapers, and Necklines
- A rounded back hairline that grows out gracefully with a natural finish.
- TapotementTreatments, Modalities, and Technique
- The massage movement consisting of rapid, light tapping or drumming with the fingertips to stimulate circulation.
- Tarsal plateFacial Anatomy
- The dense fibrous connective tissue giving the eyelid its structural rigidity.
- Tattoo blowoutPigment, Color Theory, and Healing
- Pigment deposited too deeply (below the papillary dermis) that spreads into the reticular dermis or subcutaneous tissue.
- TeasylightsColor and Chemical Services
- Softly blended highlights with broken, natural root lines, created by teasing before applying.
- TelangiectasiaSkin Analysis, Disorders, and Lesions
- Permanently dilated capillaries near the skin surface, common with rosacea and sun damage.
- Telangiectatic matsClient Assessment and Complications
- Clusters of dilated spider veins; fragile capillaries that raise bleeding and bruising risk.
- TelogenHair Biology and Removal Science
- The resting phase of the hair cycle, during which the hair is retained in the follicle but no growth occurs.
- Telogen effluviumClient Conditions and Outcomes
- Diffuse temporary shedding weeks to months after significant physical or emotional stress.
- Temp fadeFades, Tapers, and Necklines
- A shape-up and fade concentrated at the temple, cleanly shaping the hairline.
- Temperature testingHair Removal
- Test hot towels and warm wax on your own inner wrist before applying.
- Tensile strengthHair Science and Structure
- The maximum force hair withstands before breaking, reflecting disulfide bond strength.
- TensionHaircutting and Design
- The amount of pulling pressure applied to a subsection before the cut.
- Terminal lengthHair Science and Structure
- The maximum genetic length hair reaches, determined by the duration of the anagen phase.
- Terminal vs. vellus hairHair and Follicle Biology
- Terminal is thick, coarse, and pigmented; vellus is fine, soft, and largely unpigmented.
- Test curlChemical Texture Services
- A rod is unwound partway to check for a firm S-shape matching the rod.
- Testing the edgeShaving
- A straight razor's edge is checked for nicks by drawing it across a moistened fingernail or test pad.
- TEWLSkin Structure and Physiology
- Water evaporating out through the epidermis; when elevated it signals a compromised barrier.
- TextureClient Consultation and Hair and Skin Analysis
- The diameter or thickness of an individual hair strand (fine, medium, coarse).
- Texture (hair)Client Consultation and Hair, Skin, and Nail Analysis
- The diameter or thickness of an individual hair strand (fine, medium, coarse).
- TexturizingChemical Texture Services
- Using a relaxer for a shorter time or in a milder formula to partially reduce curl rather than straighten.
- ThalassotherapyTreatments, Modalities, and Technique
- Therapeutic use of seawater, seaweed, algae, sea mud, and sea climate.
- The sporeInfection Control, Regulation, and Practice
- The reproductive structure of fungi that enables environmental spread and resistance to desiccation.
- Thenar eminenceAnatomy, Physiology, and Skin Science
- The muscle group forming the fleshy pad at the base of the thumb.
- Thermal reconditioningChemical Texture Services
- A permanent straightening service combining a chemical softener with flat-iron heat.
- Thermal reconditioning (Japanese straightening)Chemical Texture Services
- A permanent straightening service combining a chemical softener with flat-iron heat.
- Thinning phaseClient Conditions and Outcomes
- Progressive reduction in hair density as more follicles are permanently destroyed each session.
- Thio vs. hydroxide relaxerChemical Texture Services
- Thio loosens the curl; hydroxide straightens permanently via lanthionization.
- Thio-free permChemical Texture Services
- Uses cysteamine or another non-thio reducing agent, for clients sensitive to thioglycolate.
- Thioglycolate (thio) relaxerChemical Texture Services
- A relaxer using thiol chemistry - different from hydroxide relaxers and not interchangeable with them.
- ThreadingHair Removal
- Twisted cotton thread lifts hair from the follicle; the thread is fresh per client.
- Threading for browsLash and Brow Services
- Especially suited to shaping brows and the upper lip.
- Three-point stretchTechniques and Design
- Thumb and index finger stretch the skin while the ring finger anchors it.
- ThrowNeedles, Machines, and Equipment
- How far the needle travels during each up-down cycle.
- Timing controlEquipment and Technique
- Controls the duration of current applied to each follicle.
- Tinea capitisHair Biology and Removal Science
- A fungal infection of the scalp that causes scaly patches, brittle hair, and possible hair loss, most common in children.
- Tinea pedisNail Disorders and Conditions
- Athlete's foot - a contagious fungal infection spread via basins and tools; a pedicure contraindication.
- Tinea versicolorClient Consultation and Hair, Skin, and Nail Analysis
- A superficial fungal infection causing patches lighter or darker than surrounding skin.
- Tonal valueHaircoloring
- The warmth or coolness of a hair color.
- ToneHaircoloring
- The dominant visible hue within a level - warm (red, orange, gold) or cool (ash, blue, violet).
- TonerHaircoloring
- Applied to pre-lightened hair to tone and neutralize unwanted color.
- Toner touch-upColor and Chemical Services
- Refreshes the cool or warm tone on pre-lightened hair without lifting further.
- Top knot vs. manMen's Cuts and Styles
- A top knot sits specifically high on the crown; a man bun sits at the nape or mid-head.
- Traction AlopeciaHair Biology and Removal Science
- Hair loss resulting from chronic mechanical tension on the follicle, such as from tight braids, ponytails, or extensions worn over long periods.
- Traction alopeciaClient Conditions and Outcomes
- Hair loss from prolonged excessive tension, as from tight hairstyles.
- Transepidermal water lossSkin, Products, and Safety
- Water evaporating out through the outer epidermal layer to the atmosphere.
- Transient floraInfection Control and Regulation
- Microorganisms temporarily present from environmental contact, removable by hand washing.
- Transition zoneConsultation, Analysis, and Safety
- Where natural new growth meets previously relaxed hair - the weakest point on the strand.
- Transmission-based precautionsInfection Control and Regulation
- Added precautions for a known or suspected specific pathogen - layered on top of standard precautions.
- Traveling guidelineHaircutting and Design
- A guide that moves with each section - each new section meets the previously cut one.
- Treated catagen hairHair and Follicle Biology
- Slides out easily but without a bulbous root sheath, because it already detached from the papilla.
- Treatment clearanceClient Conditions and Outcomes
- The initial clearing of all visible hair in an area, followed by maintenance of regrowth.
- TrichoptilosisClient Conditions and Outcomes
- Splitting of the hair shaft longitudinally at the distal end (split ends).
- Trichorrhexis nodosaClient Consultation and Hair and Skin Analysis
- A shaft defect with weak nodes where breakage occurs; commonly associated with coily hair.
- TrichosisHair Biology and Removal Science
- The general term for any scalp disorder.
- Trigeminal nerveSkin Structure and Physiology
- Its supraorbital, infraorbital, and mental branches carry sensory information from forehead, midface, and chin.
- Trigeminal nerve (fifth cranial)Skin Structure and Physiology
- The largest cranial nerve and the chief sensory nerve of the face.
- TuberculocidalInfection Control and Regulation
- A disinfectant label claim that the product kills the TB bacterium, among the hardiest germs that do not form spores, so it marks broad-spectrum strength.
- Tweezing directionHair Removal
- Each hair is pulled in the direction of natural growth.
- Tweezing indicationHair Removal
- Best for removing a small number of individual stray hairs.
- Two-block cutMen's Cuts and Styles
- Clearly defined shorter sides and back contrasting with a distinctly longer top.
- Two-handed techniqueEquipment and Technique
- One hand stretches the skin while the other holds the probe holder for accurate insertion.
- Two-time-over shaveShaving
- Lathering and shaving the beard through two full passes for closeness.
- Tyndall effectPigment, Color Theory, and Healing
- A blue-gray discoloration caused by light scattering through pigment implanted too deeply in the skin.
U3 terms
- Ultrasonic facial treatmentSkin and Nail Services
- Uses high-frequency sound waves producing cavitation.
- UndercutMen's Cuts and Styles
- Cutting the lower sections significantly shorter than the top, creating disconnected length.
- Universal / Standard PrecautionsChemistry, Products, and Practice
- Treat all blood and body fluids as potentially infectious regardless of known health status.
V16 terms
- ValuePigment, Color Theory, and Healing
- A color's lightness or darkness on a scale from white to black.
- Vapor pressureChemistry of Nail Products
- How readily a product evaporates into the air; high vapor pressure means significant airborne vapors and a need for ventilation.
- Vasovagal responseClient Assessment and Complications
- A sudden drop in heart rate and blood pressure triggered by pain, anxiety, or the sight of blood - fainting.
- VectorInfection Control, Regulation, and Practice
- A living organism that transmits a pathogen from one host to another.
- Vegetative stageInfection Control, Regulation, and Practice
- The active, growing stage of bacterial life during which cells divide.
- Vellus hairClient Consultation and Analysis
- Fine, short, soft, colorless body hair ('peach fuzz').
- Vermilion borderFacial Anatomy
- The sharply defined edge between the colored lip tissue and the surrounding facial skin.
- VesicleSkin Analysis, Disorders, and Lesions
- A small blister-like primary lesion containing clear fluid.
- Vicarious liabilityInfection Control, Regulation, and Practice
- A salon owner can be held liable for employees' negligent acts performed within the scope of employment.
- Virgin hairHaircoloring
- Hair never chemically processed - no color, perm, relaxer, or bleach.
- Virgin vs. retouch applicationHaircoloring
- A virgin application covers the whole shaft; a retouch treats only new growth.
- VirucidalInfection Control and Regulation
- Capable of killing viruses on surfaces when used per label directions.
- VirusInfection Control, Regulation, and Practice
- A submicroscopic infectious agent that can replicate only inside the cells of a living host.
- ViscosityHair and Product Chemistry
- A product's thickness or resistance to flow.
- Vitamin C derivativesChemistry, Ingredients, and Formulation
- More stable than L-ascorbic acid at neutral pH; converted to the active form in the skin.
- VitiligoClient Consultation and Hair and Skin Analysis
- A condition characterized by patchy loss of skin pigmentation resulting in irregular white areas.
W15 terms
- Warm colorsHaircoloring
- Colors with red, orange, or yellow undertones.
- Water activityHair and Product Chemistry
- Lower water activity means greater resistance to microbial contamination.
- Wax too hotHair Removal
- Can burn or blister the skin.
- Waxing contraindicationsHair Removal
- Not over sunburned, abraded, irritated, or broken skin.
- WeatheringHair and Scalp Science
- Cumulative structural damage along the shaft from root to tip.
- Weave vs. sliceHaircoloring
- A weave takes zig-zag sections; a slice takes a straight, solid section.
- Weight lineHaircutting
- The visual line where hair accumulates due to graduation - the heaviest, most solid line in the cut.
- Well (nail tip)Nail Care
- The part of a nail tip that contacts and is glued to the natural nail plate.
- Wet cutCutting Technique
- Wet hair shows perimeter lines clearly and cuts consistently with scissors.
- WhealSkin Analysis, Disorders, and Lesions
- A primary lesion: transient, edematous, raised, with irregular borders.
- Whorl / cowlickShaving
- Best shaved by following the changing direction of growth.
- Widow's peakClient Consultation and Hair and Skin Analysis
- A V-shaped point of hair at the front hairline.
- Wood's lampSkin and Nail Services
- A near-UV lamp that makes certain skin conditions fluoresce for analysis.
- Work practice controlsInfection Control and Regulation
- Changes in how tasks are performed to reduce exposure risk.
- Wrapping (winding) patternChemical Texture Services
- The directional pattern in which perm rods are wound, setting the curl direction.
Z2 terms
- Zero fadeFades, Tapers, and Necklines
- A skin-level fade where the shortest section goes down to bare scalp.
- Zero-gap adjustmentImplements and Equipment
- Setting the top blade as close as possible to the bottom without touching.
#7 terms
- '1-on-top' specificationMen's Cuts and Styles
- The top is cut with a #1 guard, leaving roughly 1/8 inch.
- '10 seconds or 10Chemical Texture Services
- Warning signs of a chemical problem appear within the first minutes of a service.
- 10-volume developerHaircoloring
- Deposits color with minimal lift.
- 14-point shaveShaving
- The classic professional shave, named for the 14 areas of the face and neck worked in a set order.
- 1RLNeedles, Machines, and Equipment
- One single Round Liner needle.
- 20-volume developerHaircoloring
- Generally used to lift about one to two levels.
- 5 o'clock shadowFacial Hair and Shaving
- Roughly half a day's stubble growth after a clean shave.
No term matches that. Try a shorter word.