Hair (noun) Definition, Meaning & Examples

noun

any of the numerous fine, usually cylindrical, keratinous filaments growing from the skin of humans and animals; a pilus.
an aggregate of such filaments, as that covering the human head or forming the coat of most mammals.
a similar fine, filamentous outgrowth from the body of insects, spiders, etc.
a filamentous outgrowth of the epidermis.
cloth made of hair from animals, as camel and alpaca.
a very small amount, degree, measure, magnitude, etc.; a fraction, as of time or space: He lost the race by a hair.

Idioms

to annoy or bother someone: Their snobbishness gets in my hair.
a drink of liquor, supposed to relieve a hangover: Even a hair of the dog didn't help his aching head.
let one's hair down, Informal.

to relax; behave informally: He finally let his hair down and actually cracked a joke.
to speak candidly or frankly; remove or reduce restraints: He let his hair down and told them about his anxieties.

to strike or fill with horror; terrify: The tales of the jungle made our hair stand on end.
to make unnecessarily fine or petty distinctions: To argue about whether they arrived at two o'clock or at 2:01 is just splitting hairs.
to manifest extreme anxiety, grief, or anger: He's tearing his hair over the way he was treated by them.
perfect to the smallest detail; exactly: The reproduction matched the original to a hair.
without showing the least excitement or emotion.

noun

any of the threadlike pigmented structures that grow from follicles beneath the skin of mammals and consist of layers of dead keratinized cells
a growth of such structures, as on the human head or animal body, which helps prevent heat loss from the body
any threadlike outgrowth from the epidermis, such as a root hair

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