/ Dictionary / Index M Mattoon: Meaning and Definition of Find definitions for: Mat•toon Pronunciation: (mu-tn'), [key] — n. a city in E Illinois. 19,787. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Matto Grosso mattrass 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