Definify.com
Webster 1913 Edition
Invagination
In-vagˊi-na′tion
,Noun.
[L. pref.
in-
+ vagina
sheath.] 1.
(Biol.)
The condition of an invaginated organ or part.
☞ 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.