ceruleum

== English == === Etymology === From Latin ceruleum (“dark blue, dark green”). === Noun === ceruleum (uncountable) A greenish-blue pigment consisting essentially of cobalt stannate. ==== Related terms ==== cerulean == Latin == === Adjective === ceruleum inflection of ceruleus: nominative/accusative/vocative neuter singular accusative masculine singular === References === "ceruleum", 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)