a hair or the hair of a horse, especially from the mane or tail.
a sturdy, glossy fabric woven of this hair.
of or pertaining to horsehair: a horsehair mattress.

1275–1325; Middle English hors here. See horse, hair

horsehaired, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
horsehair (ˈhɔːsˌhɛə)
a.  hair taken chiefly from the tail or mane of a horse, used in upholstery and for fabric, etc
 b.  (as modifier): a horsehair mattress

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica


animal fibre obtained from the manes and tails of horses and ranging in length from 8 inches (20 cm) to 3 feet (90 cm) and most often of black colour. It is coarse, strong, lustrous, and resilient and usually has a hollow central canal, or medulla, making it fairly low in density. Hair taken from the mane is softest and ranges from 50 to 150 microns (a micron is about 0.00004 inch) in diameter. Hair from the tail, coarser and with greater resilience, ranges from 75 to 280 microns in diameter and is marketed separately

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Excellent acoustics, a wide stage visible from every corner of the room, and a
  horsehair and tire-sprung hardwood dance floor.
The ancients believed that an eel grew from a single horsehair dropped in the
Their brains, intestines, and other organs had been removed and the corpses
  sewn up with horsehair.
Made of real horsehair, they can be dyed and tightly woven into a band.
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