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The Collaborative International Dictionary of English v.0.48 (gcide)

Horsehair \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.
[1913 Webster PJC]

{Horsehair worm} (Zool.), the hair worm or gordius.
[1913 Webster]