The Collaborative International Dictionary of English v.0.48:

Villous \Vil"lous\, a. [L. villosus: cf. F. villeux. Cf.
   Velvet.]
   1. Abounding in, or covered with, fine hairs, or a woolly
      substance; shaggy with soft hairs; nappy.
      [1913 Webster]

   2. (Anat.) Furnished or clothed with villi.
      [1913 Webster]