/ Dictionary / Index M macromere: Meaning and Definition of Find definitions for: mac•ro•mere Pronunciation: (mak'ru-mēr"), [key] — n. Embryol. one of the large blastomeres that form toward the vegetal pole in embryos undergoing unequal cleavage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. macrolith macrometeorology Related Content Daily Word Quiz: entomology Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language