2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: 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] From WordNet (r) 2.0 [wn]: 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}]
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