Noun
1. Large valvular flaps projecting into the lumen of the bowel. (wikipedia.org)
2. The numerous folds of the mucous membrane of the small intestine, running transversely for about two-thirds of the circumference of the gut. (biology-online.org)
Syn: circular folds, valves of Kerckring, plicae circulares, valvulae conniventes