/ Dictionary / Index M macromutant: Meaning and Definition of Find definitions for: mac•ro•mu•tant Pronunciation: (mak"rō-myt'nt), [key] — adj. undergoing macromutation. resulting from macromutation. —n. a new type of organism resulting from macromutation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. macromolecule macromutation Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language