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