/ Dictionary / Index M matri-: Meaning and Definition of Find definitions for: matri- Pronunciation: [key] a combining form meaning “mother,” used in the formation of compound words: matrilineal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. matrass matriarch Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language