oh goody, a chance to display my hair(y) collection:

alopecia - loss of hair: baldness
glabrous - smooth, esp: having a surface without hairs or projections
horripilation - the erection of the hair of the head or body from fear or cold
poliosis - graying of the hair
tetrapyloctomy - the art of splitting a hair four ways (Umberto Eco coinage?)
trichoptilosis - a longitudinal splitting of hair fiber better known as split ends
trichotillomania - the abnormal urge to pull out one's hair

(and since bridget weighed in with dasypygal) hirsute - roughly hairy, esp covered with coarse, stiff hair