- The definition of a hair is a fine, thread-like strand that grows on people and animals.
- An example of hair is the stuff you have growing from the top of your head and that you lose if you go bald.
- An example of hair is the stuff your dog sheds.
A woman having her hair styled.
hair definition by Webster's New World
- any of the fine, threadlike outgrowths from the skin of an animal or human being
- a growth of these; esp.,
- the growth covering the human head
- the growth covering all or part of the skin of most mammals
- material woven from hair
- an extremely small space, margin, degree, etc.: to miss by a hair
- Bot. a threadlike growth on a plant; trichome
Origin: Middle English here ; from Old English hær (akin to German haar, Frankish an unverified form harja) and amp; ; from uncertain or unknown; perhaps Old French haire, hair shirt ; from Frankish an unverified form harja ; from Indo-European base an unverified form er(s)-, to bristle
- made of or with hair
- for the care of the hair: hair tonic
- hairlike adjective
hair definition by American Heritage Dictionary
- a. Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.b. A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human.
- A filamentous projection or bristle similar to a hair, such as a seta of an arthropod or an epidermal process of a plant.
- Fabric made from the hair of certain animals: a coat of alpaca hair.
- a. A minute distance or narrow margin: won by a hair.b. A precise or exact degree: calibrated to a hair.
Origin: Middle English her, from Old English hǣr.
hair - Ologies & -Isms Definition
hair - Medical Definition
- Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.
- A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human.
- One of the fine hairlike processes of a sensory cell.
hair - Phrases/Idioms
get in one's hairâ
hair of the dog (that bit one)
have (or get) by the short hairs
let one's hair down
make one's hair stand on end
not turn a hair
to a hair
hair - Science Definition
- One of the fine strands that grow from the skin of mammals, usually providing insulation against the cold. Modified hairs sometimes serve as protective defenses, as in the quills of a porcupine or hedgehog, or as tactile organs, as in the whiskers (called vibrissae) of many nocturnal mammals. Hair filaments are a modification of the epidermis of the skin and are composed primarily of keratin. Hair also contains melanin, which determines hair color.
- A slender growth resembling a mammalian hair, found on insects and other animals.
- A fine, threadlike growth from the epidermis of plants. See more at trichome.