Webster
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Webster’s Revised Unabridged Dictionary · 1913

Invagination

In·vag′i·na′tion (·nā′shŭn), 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’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.