Found 2 items, similar to Invagination.
English → English (WordNet) Definition: invagination invagination n 1: the condition of being folded inward or sheathed [syn: introversion] 2: the folding in of an outer layer so as to form a pocket in the surface; “the invagination of the blastula” [syn: introversion, intussusception, infolding]
English → English (gcide) Definition: Invagination Invagination \In*vag`i*na"tion\, n. [L. pref. in- + vagina sheath.] [1913 Webster] 1. (Biol.) The condition of an invaginated organ or part. [1913 Webster] 2. The inward movement of the wall of a tissue or cell, to form a cavity; also, the cavity thus formed. [PJC] 3. Specifically: (Biol., Embryology) The inward movement of one part of the wall of a blastula, to form a gastrula; the process of gastrulation, in which layers of the ovum are differentiated. [1913 Webster +PJC] Note: In embolic invagination, one half of the blastosphere is pushed in towards the other half, producing an embryonic form known as a gastrula. -- In epibolic invagination , a phenomenon in the development of some invertebrate ova, the epiblast appears to grow over or around the hypoblast. [1913 Webster]