/ Dictionary / Index B blastocoel: Meaning and Definition of Find definitions for: blas•to•coel Pronunciation: (blas'tu-sēl"), [key] — n. Embryol. the cavity of a blastula, arising in the course of cleavage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blastocoel (Thesaurus) blasto- blastocyst 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