WordReference Random House Unabridged Dictionary of American English © 2017
- the act or process of invaginating.
- Developmental Biology[Embryol.]the inward movement of a portion of the wall of a blastula in the formation of a gastrula.
- Pathologyintussusception (def. 3).
- Anatomya form or shape resulting from an infolded tissue.
- invaginate + -ion 1650–60