Quadrilateral

kwod-ri-lat′ėr-al, adj. having four sides.— n. ( geom. ) a plane figure having four sides: the four fortre es—Mantua, Verona, Peschiera, and Legnago—which form the points of a quadrilateral.— n. Quadrilat′eralne . [L. quadrilaterus — quatuor , four, lat us , later is , a side.]