Etymology
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hair (n.)

Old English hær "hair, a hair," from Proto-Germanic *hēran (source also of Old Saxon, Old Norse, Old High German har, Old Frisian her, Dutch and German haar "hair"), perhaps from PIE *ghers- "to stand out, to bristle, rise to a point" (source also of Lithuanian šerys "bristle;" see horror).

Spelling influenced by Old Norse har and Old English haire "haircloth," from Old French haire, from Frankish *harja or some other Germanic source (see above). Hair-dye is from 1803. To let one's hair down "become familiar" is first recorded 1850. Homeopathic phrase hair of the dog (that bit you), remedy from the same thing that caused the malady, especially a drink on the morning after a debauch, 1540s in English, is in Pliny.

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Definitions of hair

hair (n.)
a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss;
each hair consists of layers of dead keratinized cells
he combed his hair
hair (n.)
a very small distance or space;
they escaped by a hair's-breadth
Synonyms: hair's-breadth / hairsbreadth / whisker
hair (n.)
filamentous hairlike growth on a plant;
Synonyms: fuzz / tomentum
hair (n.)
any of the cylindrical filaments characteristically growing from the epidermis of a mammal;
there is a hair in my soup
Synonyms: pilus
hair (n.)
cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments;
Synonyms: haircloth
hair (n.)
a filamentous projection or process on an organism;
From wordnet.princeton.edu