/ Dictionary / Index M Matto Grosso: Meaning and Definition of Find definitions for: Mat•to Gros•so Pronunciation: (mat'u grō'sō Port. mä't&oobreve grô's&oobreve). [key] See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mattock Mattoon Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language