Pronunciation (US) enPR: kwŏdʹrăng'gl, IPA (key): /ˈkwɒdˌræŋ.ɡəl/ Audio (US)(file) Noun Singular quadrangle Plural quadrangles (countable) (geometry) A quadrangle is a shape with four angles and four straight sides. Synonyms: tetragon, quadragon, tetrangle, tetrilateral and quadrilateral Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads