/ Dictionary / Index M matrices: Meaning and Definition of Find definitions for: ma•tri•ces Pronunciation: (mā'tri-sēz", ma'tri-), [key] — n. a pl. of Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: matrices (Thesaurus) matriarchy matricide Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language