[syn: invagination, introversion, intussusception, infolding]
The Collaborative International Dictionary of English v.0.48:
Invagination \In*vag`i*na"tion\, n. [L. pref. in- + vagina
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. 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
[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.
WordNet (r) 3.0 (2006):
n 1: the condition of being folded inward or sheathed [syn:
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,