/ Dictionary / Index E entoblast: Meaning and Definition of Find definitions for: en•to•blast Pronunciation: (en'tu-blast"), [key] — n. Embryol. endoderm. hypoblast (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: entoblast (Thesaurus) ento- entoderm 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