/ Dictionary / Index M messieurs: Meaning and Definition of Find definitions for: mes•sieurs Pronunciation: (mās-yûrz', mes'urz Fr. me-syœ'), [key] — n. pl. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: messieurs (Thesaurus) Messier number messily 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