Horsehair

noun

1. The hair of a horse, especially from the mane or tail.
2. Cloth made of the hair of horses.
3. The hair of horses, more particularly the hair of the mane and tail. It is used for the making of hair-cloth, the stuffing of mattresses and cushions, etc.
4. Made of horsehair; covered, filled, or stuffed with horsehair: as, horsehair covering; a horsehair mattress.
5. A hair of a horse, especially one from the mane or tail; the hairs of the mane or tail taken collectively