/ Dictionary / Index M mutagenesis: Meaning and Definition of Find definitions for: mu•ta•gen•e•sis Pronunciation: (my"tu-jen'u-sis), [key] — n. the origin and development of a mutation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mutagenesis (Thesaurus) mutagen mutagenic 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