inˌvagiˈnation

/ ɪnˌvædʒɪˈneɪʃən /

noun

1. pathol the process of invaginating or the condition of being invaginated; intussusception
2. pathol an invaginated organ or part
3. an infolding of the outer layer of cells of an organism or part of an organism so as to form a pocket in the surface, as in the embryonic development of a gastrula from a blastula