Wool

n. [A-S. wull, Goth. wulla, O. Fries. wolle, ulle, L. Ger. wulle, D. wol, O. H. Ger. wolle, N. H. Ger. wolle, Icel. & Sw. ull, Dan. uld, Lith. wilna, Slav. volna, Finn. willa, Basque ulea, allied to Lat. villus, vellus, Gr. οὖλος.]

1. That soft, curled, or crisped species of hair which grows on sheep and some other animals, and which in fineness sometimes approaches to fur; — chiefly applied to the fleecy coat of the sheep, which constitutes a most essential material of clothing in all cold and temperate climates.
2. Short, thick hair, especially when crisped or curled.
3. (Bot.) A sort of pubescence, or a clothing of dense, curling hairs on the surface of certain plants.