aggregated lymphatic follicles

[ăgrĭ-gā′tĭd]
pl.n.
  1. Collections of many lymphoid follicles closely packed together, forming oblong elevations on the mucous membrane of the small intestine.aggregate glands agminate glands Peyer's patches
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.