"quadrilateral" in German quadrilateral Viereck Tetragon Geviert vierseitig Detailed translations for "quadrilateral" quadrilateral 1. mathematics quadrilateral(also: quadrangle, quad, tetragon) das Viereck{neuter} quadrilateral(also: quadrangle, quad, tetragon) das Tetragon{neuter} quadrilateral(also: quadrangle, quad, tetragon) das Geviert{neuter} 2. other quadrilateral(also: four-sided) vierseitig{adjectiv} English synonyms for "quadrilateral" quadrilateral {n} quadrangle tetragon quadrilateral {s} four-sided