Definition of hair

• 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"
• any of the cylindrical filaments characteristically growing from the epidermis of a mammal; "there is a hair in my soup"
• cloth woven from horsehair or camelhair; used for upholstery or stiffening in garments