/ Dictionary / Index B blastomere: Meaning and Definition of Find definitions for: blas•to•mere Pronunciation: (blas'tu-mēr"), [key] — n. Embryol. any cell produced during cleavage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blastomere (Thesaurus) blastoma blastomycete Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language