Lewis & Short

villus, i, m. [Sanscr. urā, sheep; Gr. εἶρος, wool; cf. vellus], shaggy hair, a tuft of hair; of beasts, Cic. N. D. 2, 47, 121; id. ib. 2, 63, 158; Verg. G. 3, 446; id. A. 5, 352; Ov. H. 6, 49; Mart. 14, 136, 2; Sid. Ep. 5, 17 med. al.
Of cotton, Plin. 11, 23, 27, § 77: tonsis mantelia villis, the nap of cloth, Verg. G. 4, 377; id. A. 1, 702.