Vil·lus n.; pl. Villi
1. Anat. One of the minute papillary processes on certain vascular membranes; a villosity; as, villi cover the lining of the small intestines of many animals and serve to increase the absorbing surface.
2. pl. Bot. Fine hairs on plants, resembling the pile of velvet.
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villus
n : a minute hairlike projection on mucous membrane
[also: villi (pl)]