horse·hair /ˈhɔrsˌhær, ˌhɛr/
Horse·hair n. A hair of a horse, especially one from the mane or tail; the hairs of the mane or tail taken collectively; Specifically: a black shiny fabric made of such hairs, used commonly in the 1800's as a covering for stuffed furniture such as chairs and couches.
Horsehair worm Zool., the hair worm or gordius.
n 1: hair taken from the mane or tail of a horse
2: fabric made from horsehair fibers; used for upholstery