/ Dictionary / Index M Messier: Meaning and Definition of Find definitions for: Mes•sier Pronunciation: (mes'ē-ā" Fr. me-syā'), [key] — n. 1730–1817, French astronomer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: messier (Thesaurus) Messidor Messier catalog 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