villus

Definitions

  • WordNet 3.6
    • n villus a minute hairlike projection on mucous membrane
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Webster's Revised Unabridged Dictionary
    • Villus (Bot) Fine hairs on plants, resembling the pile of velvet.
    • Villus (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.
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Century Dictionary and Cyclopedia
    • n villus In anatomy: One of numerous minute vascular projections from the mucous membrane of the intestine, of a conical, cylindric, clubbed, or filiform shape, consisting essentially of a lacteal vessel as a central axis, with an arteriole and a veinlet, inclosed in a layer of epithelium, with the basement membrane and muscular tissue of the mucous membrane, and cellular or reticular tissue. The villi occur chieflly in the small intestine, and especially iu the upper part of that tube; there are estimated to be several millions in man; they collectively constitute the beginnings of the absorbent or lacteal vessels of the intestine. See also cut under lymphatic.
    • n villus One of the little vascular tufts or processes of the shaggy chorion of an ovum or embryo, in later stages of development entering into the formation of the fetal part of the placenta. See cut under uterus, Some villiform part or process of various animals. See cut under hydranth.
    • n villus In botany, one of the long, straight, and soft, hairs which sometimes cover the fruit, flowers, and other parts of plants.
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Etymology

Webster's Revised Unabridged Dictionary
L., shaggy hair, a tuft of hair

Usage

In literature:

Each villus has two sets of vessels.
"The People's Common Sense Medical Adviser in Plain English" by R. V. Pierce
Write as explicit an account as you can of the absorbent action of a villus.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
Villus: a short, hair-like or papillate process on the surface of certain absorbent and sensory organs.
"Explanation of Terms Used in Entomology" by John. B. Smith
The fats in the form of soaps and fatty acids pass into the space in the center of the villus.
"A Civic Biology" by George William Hunter
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