orthogonium

== English == === Etymology === From Ancient Greek ὀρθογώνιος (orthogṓnios, “right-angled”). === Noun === orthogonium (plural orthogonia) right-angled triangle == Latin == === Adjective === orthogōnium inflection of orthogōnius: nominative/accusative/vocative neuter singular accusative masculine singular === References === "orthogonium", in Charles du Fresne du Cange, Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)