intestinal villus

n.
  1. Any of the many projections of the mucous membrane of the intestine that serve as sites of absorption and that are leaf-shaped in the duodenum and become shorter, more finger-shaped, and sparser in the ileum.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.