Pronunciation: (in-vaj"u-nā'shun), [key]
1. the act or process of invaginating.
2. Embryol.the inward movement of a portion of the wall of a blastula in the formation of a gastrula.
3. Pathol.intussusception (def. 3).
4. a form or shape resulting from an infolded tissue.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.