/ Dictionary / Index M millimole: Meaning and Definition of Find definitions for: mil•li•mole Pronunciation: (mil'u-mōl"), [key] — n. one thousandth of a mole. Abbr.: mM Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. millimicron milline Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language