/ Dictionary / Index M messroom: Meaning and Definition of Find definitions for: mess•room Pronunciation: (mes'rm", -room"), [key] — n. a dining room aboard ship or at a naval base. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. messmate Messrs Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language