/ Dictionary / Index M matrilateral: Meaning and Definition of Find definitions for: mat•ri•lat•er•al Pronunciation: (ma"tru-lat'ur-ul, mā"-), [key] — adj. related through the mother, as to a maternal uncle. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. matrifocal matrilineage Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language