villus /vil·lus/ (vil´us) pl. vil´li [L.] a small vascular process or protrusion, especially from the free surface of a membrane.
intestinal villi,
arachnoid villi
1. microscopic projections of the arachnoid into some of the venous sinuses.
chorionic villus one of the threadlike projections growing in tufts on the external surface of the chorion.
intestinal villi multitudinous threadlike projections covering the surface of the mucous membrane lining the small intestine, serving as the sites of absorption of fluids and nutrients. 
)
Intestinal villus.
synovial villi slender projections of the synovial membrane from its free inner surface into the joint cavity.
intestinal villi,
the multitudinous threadlike projections that cover the surface of the mucosa of the small intestine and serve as the sites of absorption (by active transport and diffusion) of fluids and nutrients.
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