/ Dictionary / Index G gastrulation: Meaning and Definition of Find definitions for: gas•tru•la•tion Pronunciation: (gas"troo-lā'shun), [key] — n. Embryol. the formation of a gastrula. any process, as invagination, by which a blastula or other form of embryo is converted into a gastrula. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gastrulation (Thesaurus) gastrulate gas tube Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language