Share this entry

Share this page

villus

Line breaks: vil¦lus
Pronunciation: /ˈvɪləs
 
/

Definition of villus in English:

noun (plural villi /-lʌɪ, -liː/)

Anatomy
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.

Origin

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

Derivatives

villiform

1
adjective
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.

villose

2
adjective
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.

Definition of villus in:

Share this entry

Share this page

 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day snarf
Pronunciation: snɑːf
verb
eat or drink quickly or greedily