quā̆drĭangŭlus, a, um, adj. [quattuor-angulus],
four-cornered , quadrangular (post-Aug.); figura, Plin. 13, 22, 38, § 118: herba quadriangulo caule, id. 25, 6, 27, § 63: membrum, Aus. Epigr. 128. — As subst.: quădrĭangŭlum , i, n., a quadrilateral figure , quadrangle , Prisc. Fig. Num. p. 417; cf. quadrangulum.