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villus Line breaks: vil¦lus
Pronunciation: /ˈvɪləs/

Definition of villus in English:

noun (plural villi ˈvɪlʌɪˈvɪliː)

1Any of numerous minute elongated projections set closely together on a surface, in particular:
Example sentences
  • Mutants were observed as non-staining ribbons on the surface of the villus.
  • And the tiny hair-like projections on the cells - the villi (VIL-li) - shrink and may even disappear.
  • The colon can be identified by its size and the absence of mucosal folds and villi; the inner surface is smooth.
1.1A finger-like projection of the lining of the small intestine.
Example sentences
  • The inner lining of the large intestine lacks the villi that characterize the small intestine.
  • The lining of the small intestine is folded into finger-like projections, the villi, and deeper glands, the crypts.
  • They are absorbed by the villi of the small intestine and carried by the portal vein to the liver.
1.2A fold of the chorion.
Example sentences
  • Amniotic fluid, chorionic villi, or fetal serum can be tested for evidence of West Nile virus infection.
  • Placenta increta is the invasion of the myometrium by chorionic villi.
  • If chorionic villi are not detected, ectopic pregnancy should be suspected.


Early 18th century: from Latin, literally 'shaggy hair'.



Pronunciation: /ˈvɪlɪfɔːm/
Example sentences
  • On opening, the colon revealed numerous wormlike or villiform polyps covering almost the entire segment of the sigmoid colon.
  • In some areas the mucosa lining the cyst had a slightly villiform appearance, whereas elsewhere it was flattened and simplified.
  • Although the neoplasm contained numerous capillary-sized vessels, clefted spaces and villiform structures were not apparent.


Pronunciation: /ˈvɪləʊs/
Example sentences
  • The villose spineflower occurs from Point Reyes in Marin Co., California, to Bodega Bay in Sonoma Co.
  • It is easily recognized by its long, stiff (villose) hairs for which it received its specific epithet.
  • Flowers in fascicles, pedicels long, slender and villose, 1-5 flowers per inflorescence, 15-25 mm long, calyx obconic and four-ribbed, 4-lobed, white, campanulate, contracted into a stigmatic apex, stamens 8-16; flowers appear March to May.

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