/ Dictionary / Index M M roof: Meaning and Definition of Find definitions for: M roof Pronunciation: [key] a roof having the form of two parallel gable roofs. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mr. Nice Guy M.R.P. Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language