The Curly Dictionary is an overview of the most important terms related to caring for curly, wavy, and afro hair. Here you'll find simply explained terms — from curl types (2A–4C) through porosity and protein to techniques like plopping, scrunching, refresh, or cast. We explain every term clearly, even for complete beginners, so you know exactly what your hair needs and why.
Whether you're just starting out with curls or you're an experienced "curly girl," this dictionary will help you understand guides, product ingredients, and advice you come across elsewhere.
Curly dictionary
A
Afro Pick
A comb with long teeth used to lift hair at the roots without disturbing curl definition. Especially suited for thick curly and afro hair.
Air Drying
Drying hair without using heat. Minimizes damage, but if done incorrectly can increase frizz.
ACV Rinse
A rinse with apple cider vinegar (ACV) that helps remove buildup, boosts shine, and balances the scalp's pH. Ideal as an addition to a clarifying routine.
Curl Activator
A lightweight styling product, most often a cream or milk, that activates the hair's natural curl pattern and gives it bounce and definition. Unlike gel, it doesn't create a hard cast. Suited for finer hair or as a first layer before gel. Some curl activators also double as a leave-in conditioner.
B
Big Chop
Radically cutting off damaged or chemically treated hair when returning to your natural texture. The first step for many people transitioning to the Curly Girl Method.
Bonnet
A satin or silk sleep cap that protects curls from friction, breakage, and moisture loss overnight.
Bounce Curl Brush
A styling brush designed to create defined clumps and encourage clumping. Works best on medium-to-thick curly hair.
Bowl Method
A technique of soaking hair in water with product, which significantly boosts hydration and helps create defined curls. The water should be lukewarm, not hot.
Butter (Hair Butter)
A thick, rich product based on natural butters (shea, mango, coconut) that provides intense nourishment, softens hair, and locks in moisture. Especially suited for very dry, coarse, highly porous hair types 4A–4C. For finer hair it can be too heavy and weigh it down.
Build-up
A buildup of products, oils, and minerals on the hair that stops moisture from penetrating the hair shaft. If your hair stops responding to products or feels heavy and lifeless, this is most often the culprit. The fix is a clarifying shampoo.
C
Cast
A firmer layer formed by gel as it dries, which helps hold the curl shape and protects curls from outside humidity. Once fully dry, it's gently broken up using the SOTC technique.
CGM-friendly
A label for products compatible with the Curly Girl Method — free of sulfates, silicones, and drying alcohols. Look for this label when choosing products, or check the ingredient list against an online ingredient database.
Clarifying Shampoo
A deep-cleansing shampoo that removes buildup and restores the hair's ability to absorb moisture. Used as needed, typically once every 2–4 weeks.
Clumping
Strands of hair joining together into larger, defined clumps. It's a sign of well-hydrated, properly styled curly hair. Encouraged by scrunching, the bowl method, and the right products.
Co-wash
Washing hair with conditioner instead of shampoo. Especially suited for dry, fragile curly hair that needs gentler cleansing. Most hair types also benefit from a regular rinse-out conditioner afterward.
Crunch
The stiff feel of hair after gel has dried on it. It's not a problem — it's broken up using the SOTC technique, leaving soft, defined curls.
Curly Girl Method (CGM)
An approach to caring for curly hair (wavy, curly, and afro-textured alike) built around minimizing drying ingredients — sulfates, silicones, and alcohols — while supporting the hair's natural moisture and texture. One of the most widely followed approaches to curly hair care in the world.
Custard
A thicker styling product that falls between a gel and a cream. Suited for thick, dry, or highly porous curls that need a stronger moisture lock.
D
Deep Conditioning
An intensive hair mask left on for at least 20–30 minutes (or overnight) for deep hydration or repair. A core step in any curly routine, ideally done once a week.
Curl Definition
A state where curls are clearly separated, smooth, and free of excess frizz. Depends on hydration, products, and technique.
Denman Brush
A brush used to define curls and create even clumps. A popular technique especially for types 3A–4A.
Density
How much hair you have overall on your head. Affects how much product you need and how you approach styling.
Dew Point
A measure of moisture in the air that significantly affects how humectants like glycerin or aloe vera behave. At a low dew point (below 10°C/50°F), humectants pull moisture out of the hair and cause frizz. If it's too high (above 16°C/61°F), they can pull in too much moisture instead. Tracking the dew point helps you choose the right products for the current weather.
Diffuser
A blow-dryer attachment that spreads out the airflow and helps preserve the natural curl shape while drying.
E
Hair Elasticity
The hair's ability to stretch and spring back without breaking. It's one of the best indicators of hair health. If wet hair snaps immediately when stretched, it lacks moisture. If it stays stretched and doesn't spring back, it lacks protein.
Emulsifying
Activating a product by rubbing it between damp palms until it turns into a white emulsion. This ensures even application and better absorption.
F
Finger Coiling
Manually coiling individual strands around a finger for maximum definition. Ideal for types 3C–4C.
Flaking
White flakes in the hair, most often caused by combining incompatible products or using too much product.
Flash Drying
Hair drying out almost instantly after an unsuitable product is applied, most often one high in alcohol or water-repelling silicones.
Frizz
Frizz caused by a combination of dryness, damage, poor technique, or outside humidity. Hair pulls moisture in from its surroundings when it's lacking internal hydration — the fix isn't an anti-frizz spray, it's the right routine.
G
Hair Gel
A styling product used to set and define curls. Forms a cast and protects hair while it dries. Choice depends on the desired hold and your hair type.
Glycerin
A humectant that binds moisture from the air and draws it into the hair. Its effect depends on the dew point — see the entry for Dew Point.
H
High Porosity Hair
Hair with an open cuticle structure that absorbs moisture quickly but also loses it quickly. Needs heavier products and moisture-locking techniques (the LOC method).
Silk
A material that, like satin, minimizes friction and helps hair hold onto its moisture. Recommended for pillowcases and sleep caps.
Hold
The strength of a styling product's fixation. Higher hold means a longer-lasting style.
Hover Drying
Drying hair without letting the diffuser touch it directly, to minimize frizz and preserve volume.
Humectants
Ingredients that draw moisture into the hair from the surrounding air. These include glycerin, aloe vera, honey, and panthenol. Their effectiveness depends on the current dew point.
I
In-Shower Styling
Applying styling products to fully soaking-wet hair while still in the shower, for better definition and more even product distribution.
K
Conditioner (Rinse-Out)
A core product in any curly routine, applied after shampoo or co-washing and rinsed out with water. Softens hair, smooths the cuticle, improves detangling, and preps hair for the next steps in your routine. Choose it based on porosity — richer conditioners suit high porosity hair, lighter formulas suit low porosity hair.
Hair Cream (Styling Cream)
A medium-consistency styling product that defines curls and adds hydration and softness. Applied to wet hair after a leave-in. Unlike gel, it doesn't create a hard cast, so it's suited for finer hair or for anyone who prefers a more natural, less crunchy result. Often combined with gel — cream first, gel on top.
L
Layers
A layered haircut for curly hair that boosts volume and lets curls move more naturally.
Leave-In Conditioner
A rinse-free conditioner that helps maintain hydration and preps hair for styling.
LOC Method
A technique of layering products to lock in moisture. Liquid (L) is applied to wet hair, followed by oil (O), then cream (C). Ideal for highly porous, very dry hair that loses moisture quickly.
LCO Method
A variation of the LOC technique especially suited for low porosity curls. Oil goes on last as a protective seal — low porosity hair has a closed cuticle that struggles to absorb products, so applying oil last doesn't block absorption, it simply seals in the moisture that's already made it in.
Low Porosity Hair
Hair with a closed cuticle structure that moisture struggles to penetrate. Benefits from heat during treatments and from lighter products.
Low-Poo Shampoo
A gentle shampoo suited to regular washing without over-drying the scalp and hair.
M
Hair Mask (Deep Conditioner)
An intensive treatment product high in hydrating or protein ingredients, applied to hair and left on for at least 20–30 minutes. Unlike a regular conditioner, it penetrates deeper into the hair shaft. There are two basic types: moisturizing masks (for dry, fragile hair) and protein masks (for damaged, limp hair). Used once a week or as needed.
Micro-plopping
Gently pressing hair with a cotton t-shirt or microfiber cloth to soak up excess water — without rubbing or pulling. Done after styling products have been applied, once the hair is already treated. It's a faster, more practical alternative to plopping — instead of wrapping your whole head, you simply scrunch sections upward one at a time.
Moisture Overload
A state where hair is over-hydrated — limp, mushy, and unable to hold its shape. The fix is adding a protein treatment.
Microfiber Towel
A soft material recommended for gently drying curly hair instead of a regular terry towel, which causes friction and frizz.
N
No-poo
Washing hair without shampoo — using only conditioner or natural ingredients.
O
Hair Oil
A natural or synthetic oil used for protection, nourishment, and moisture lock. Not all oils are alike — they differ in how well they penetrate the hair. Penetrating oils (coconut, olive, avocado) go directly into the hair shaft and nourish it from within. Sealing oils (argan, jojoba, flaxseed) stay on the surface and form a protective layer. Lighter oils (such as argan or marula) suit low porosity hair better, while richer oils (such as coconut or castor) suit high porosity hair.
Oiling
Using oils to protect the ends, massage the scalp, or as a pre-poo treatment before washing.
Rinse-Out Conditioner
A product that softens hair, improves detangling, and preps hair for the next steps in your routine. A core step after every wash.
P
Pineapple
A loose, high ponytail worn during sleep to protect curls from getting smushed and losing their shape.
Plopping
A technique of wrapping wet hair in a cotton t-shirt on top of the head, which helps absorb excess water and supports curl shape without friction.
Hair Porosity
The hair's ability to absorb and hold onto moisture. One of the most important factors in choosing products and building a routine. A simple at-home test: drop a clean, washed strand of hair into a glass of water and watch it for 2–4 minutes. Hair sinks quickly — high porosity. Hair floats on the surface — low porosity. Hair sinks slowly — medium porosity.
Porosity Test
A test to determine hair porosity. Drop a clean, washed strand of hair into a glass of water and watch it for 2–4 minutes. Sinks quickly — high porosity; floats on the surface — low porosity; sinks slowly — medium porosity.
Praying Hands
A technique of applying product by smoothing it between flat palms pressed together, running them down the length of the strands for even coverage.
Pre-poo
Treating hair with oil or a mask before washing, to protect it from over-drying.
Protein Overload
A state where hair has taken on too much protein — it becomes stiff, brittle, and breaks even with gentle detangling. Can happen from overusing protein masks without enough moisture. The fix is a thorough moisturizing mask and temporarily cutting out protein products.
Puff Cuff
A special large-diameter round clip for voluminous, thick curls that holds hair up without leaving a crease.
R
Raking
Applying product by combing through the hair with your fingers for even distribution.
Refresh
Reviving curls between washes using a water spray or a refreshing spray to reactivate products.
Root Clipping
A technique of clipping sections up at the roots while drying to build more volume at the roots.
S
S2C (Squish to Condish)
Squishing conditioner and water into the hair while washing for maximum hydration. The squishing motion opens the cuticle and lets the product absorb more deeply.
Satin
One of the best materials for curly hair. Thanks to its smooth surface, it minimizes mechanical friction during sleep, helps prevent breakage and tangling, and — unlike cotton — doesn't soak up the hair's natural moisture.
Hair Serum
A lightweight, concentrated product with active ingredients for shine, heat protection, frizz reduction, or growth stimulation. Unlike oils, serum has a lighter texture and absorbs faster. It's not used for styling, but as targeted treatment.
Scrunching
Scrunching hair upward (from the ends toward the head) to encourage the curls' natural shape.
Sealing
Locking in moisture with an oil or cream as the final step of a styling routine.
Shrinkage
The shortening of curls once dry compared to their length when wet. Can range from 30–75% of the hair's length. It's not a problem — it's a sign of a healthy curl with good elasticity.
Slip
A product's ability to ease detangling and reduce friction. An important factor when choosing a conditioner.
SOTC (Scrunch Out The Cast)
Gently breaking up the gel cast with your hands once hair is fully dry. The result is soft, shiny, defined curls.
Styling
Applying products and using techniques to achieve defined, hydrated curls.
T
Thickness
The thickness of an individual strand of hair (not density). Affects how heavy a product the hair can carry.
Transitioning
The process of transitioning to natural curly hair after chemical relaxing or coloring. Can take anywhere from months to years.
Hair Types (2A–4C)
A classification of curly hair ranging from loose waves (2A) through defined curls (3A–3C) to tight afro curls (4A–4C). Each type needs a different approach to hydration and styling.
U
UV Protection for Hair
Protecting hair from sun exposure, which draws out moisture and can cause color fading. Available as sprays or products with UV filters.
V
Volume
The volume of the hair. Achieved through techniques like root clipping, hover drying, or choosing the right products.
W
Wash & Go
The basic curly routine: wash, apply products, and let it air dry. The most popular styling method for everyday wear.
Wet Frizz
Frizz that's already visible on wet hair. A sign of insufficient moisture or product, or of a poor application technique.
Z
Zig-zag (Z-Pattern)
The characteristic structure of hair type 4C — very tight zig-zag patterns instead of spirals.
Shrinkage
See the entry for Shrinkage — the shortening of curls once dry compared to their length when wet.
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