villus(redirected from arachnoid villus)
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1. Zoology anatomy any of the numerous finger-like projections of the mucous membrane lining the small intestine of many vertebrates
2. any similar membranous process, such as any of those in the mammalian placenta
3. Botany any of various hairlike outgrowths, as from the stem of a moss
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
A fingerlike projection from the surface of a membrane.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.