/ Dictionary / Index M matricide: Meaning and Definition of Find definitions for: mat•ri•cide Pronunciation: (ma'tri-sīd", mā'-), [key] — n. the act of killing one's mother. a person who kills his or her mother. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: matricide (Thesaurus) matrices matricliny 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