invagination n 1: the condition of being folded inward or sheathed [syn: invagination, introversion] 2: the folding in of an outer layer so as to form a pocket in the surface; "the invagination of the blastula" [syn: invagination, introversion, intussusception, infolding]

invagination noun Date: circa 1658 1. an act or process of invaginating; specifically the formation of a gastrula by an infolding of part of the wall of the blastula 2. an invaginated part

Invagination \In*vag`i*na"tion\, n. [L. pref. in- + vagina sheath.] 1. (Biol.) The condition of an invaginated organ or part. 2. (Biol.) One of the methods by which the various germinal layers of the ovum are differentiated. 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.

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