definition of
hair

[1] #1 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; "he combed his hair"; "each hair consists of layers of dead keratinized cells". wn

[2] #2 hair n. [hair's-breadth, hairsbreadth, whisker] a very small distance or space; "they escaped by a hair's-breadth"; "they lost the election by a whisker". wn

[3] #3 hair n. [fuzz, tomentum] filamentous hairlike growth on a plant; "peach fuzz". wn

[4] #4 hair n. [pilus] any of the cylindrical filaments characteristically growing from the epidermis of a mammal; "there is a hair in my soup". wn

[5] #5 hair n. [haircloth] cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments. wn