Hair definition

hâr
Material woven from hair.
noun
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For the care of the hair.

Hair tonic.

adjective
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An extremely small space, margin, degree, etc.

To miss by a hair.

noun
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(bot.) A threadlike growth on a plant; trichome.
noun
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Made of or with hair.
adjective
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A filamentous projection or bristle similar to a hair, such as a seta of an arthropod or an epidermal process of a plant.
noun
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Any of the fine, threadlike outgrowths from the skin of an animal or human being.
noun
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A growth of these.
  • The growth covering the human head.
  • The growth covering all or part of the skin of most mammals.
noun
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A slender growth resembling a mammalian hair, found on insects and other animals.
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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.
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A fine, threadlike growth from the epidermis of plants.
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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.

noun
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Fabric made from the hair of certain animals.

A coat of alpaca hair.

noun
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Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.
noun
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A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human.
noun
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A minute distance or narrow margin.

Won by a hair.

noun
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A precise or exact degree.

Calibrated to a hair.

noun
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A filamentous projection or bristle similar to a hair, such as a seta of an arthropod or an epidermal process of a plant.
noun
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Any of the cylindrical, keratinized, often pigmented filaments characteristically growing from the epidermis of a mammal.
noun
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A growth of such filaments, as that forming the coat of an animal or covering the scalp of a human.
noun
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(countable) A pigmented filament of keratin which grows from a follicle on the skin of humans and other mammals.

I only have hair around my genitals and on my head.

noun
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(uncountable) The collection or mass of such growths growing from the skin of humans and animals, and forming a covering for a part of the head or for any part or the whole body.

In the western world, women usually have long hair while men usually have short hair.

noun
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(zoology, countable) A slender outgrowth from the chitinous cuticle of insects, spiders, crustaceans, and other invertebrates. Such hairs are totally unlike those of vertebrates in structure, composition, and mode of growth.
noun
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(botany, countable) A cellular outgrowth of the epidermis, consisting of one or of several cells, whether pointed, hooked, knobbed, or stellated. Internal hairs occur in the flower stalk of the yellow frog lily (Nuphar).
noun
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1485, Thomas Malory, Le Morte Darthur, Book XV.

I requyre you take thys hayre that was thys holy mannes and put hit nexte thy skynne, and hit shall prevayle the gretly.

noun
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(countable) Any very small distance, or degree; a hairbreadth.

Just a little louder please - turn that knob a hair to the right.

noun
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get in someone's hair
  • to annoy someone
idiom
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hair of the dog (that bit one)
  • a drink of alcoholic liquor taken as a supposed remedy for a hangover
idiom
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have (or get) by the short hairs
  • to have (or get) completely at one's mercy
idiom
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let one's hair down
  • to be very informal, relaxed, and free in behavior
idiom
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make someone's hair stand on end
  • to terrify or horrify someone
idiom
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not turn a hair
  • to show no fear, surprise, embarrassment, etc.; stay calm and unruffled
idiom
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split hairs
  • to make petty distinctions; quibble
idiom
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to a hair
  • exactly; right in every detail
idiom
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Other Word Forms

Noun

Singular:
hair
Plural:
hairs

Idioms and Phrasal Verbs

hair of the dog (that bit one)
have (<i>or</i> get) by the short hairs
not turn a hair

Origin of hair

  • Middle English her from Old English hǣr

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle English hēr, heer, hær, from Old English her, hǣr , from Proto-Germanic *hērą. Compare West Frisian hier, Dutch haar, German Haar, Swedish hår, from Proto-Indo-European *keres- (“rough hair, bristle”). Compare Middle Irish carrach (“scurfy, mangy”), Albanian qere (“hair disease, ringworm, baldness”), Lithuanian šerys (“bristle, animal hair”), Russian шерсть (šerst’, “wool”), Sanskrit कपुच्छल (kapucchala, “napehair, shorthairs”).

    From Wiktionary