/ Dictionary / Index M mitogen: Meaning and Definition of Find definitions for: mi•to•gen Pronunciation: (mī'tu-jun, -jen"), [key] — n. Biol. any substance or agent that stimulates mitotic cell division. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mitogen (Thesaurus) mitochondrion mitosis 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