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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.

⇒ 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.


© Webster 1913.

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