/ Dictionary / Index Q quadrilateral: Meaning and Definition of Find definitions for: quad•ri•lat•er•al Pronunciation: (kwod"ru-lat'ur-ul), [key] — adj. having four sides. —n. a plane figure having four sides and four angles. something of this form. a figure formed by four straight lines that have six points of intersection. a polygon with four sides. the space enclosed between and defended by four fortresses. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: quadrilateral (Thesaurus) quad right quadrilingual Related Content Daily Word Quiz: sublime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language