/ Dictionary / Index M mutant: Meaning and Definition of Find definitions for: mu•tant Pronunciation: (myt'nt), [key] — adj. undergoing or resulting from mutation. —n. a new type of organism produced as the result of mutation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mutant (Thesaurus) mutagenic Mutare Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language