Invagination

In`vag`i`na´tion

n.	1.
	1.	(Biol.) The condition of an invaginated organ or part.
	2.	The inward movement of the wall of a tissue or cell, to form a cavity; also, the cavity thus formed.
	3.	(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.

Noun	1.	invagination - the condition of being folded inward or sheathed Synonyms: introversion
	2.	invagination - the folding in of an outer layer so as to form a pocket in the surface; "the invagination of the blastula" Synonyms: infolding, intussusception, introversion