Any of the numerous fine filaments growing from the skin of humans or animals.
A mass or aggregate of hairs covering the human head.
The mean diameter of human hair is about 100 μm (from 17 to 181 μm)
An outgrowth of the epidermis of a plant.
→ crosshairs;
→ no hair theorem;
→ Berenice’s Hair.
Etymology (EN): M.E. heer; O.E. hær; cf. O.H.G. har, Du. haar,
Ger. Haar “hair;”
PIE base *kaisaro- “hair,” from *ker(s)- “to bristle;”
cf. Skt. kesara- “hair, mane (of a horse or lion).”
Etymology (PE): Mu(y) “hair;” Mid.Pers. môy “hair.”
Gis, gisu, from Mid.Pers. ges, gesuk “hair, lock, tress,”
Av. gaêsa- “curly hair,” gaêsav-, gaêθav-
“curly, curly-haired,” cf. Gk. kaite “bushy hair, mane,”
O.Ir. gaiset, PIE *ghaites “curly hair.”
