S: (n) 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"
S: (n) keratin, ceratin (a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves)