hyperthyrum: i, n., = ὑπέρθυρον,I the lintel of a door-way, Vitr. 4, 6 dub. (al. hypothyrum).
hўperthўrum, ī, n. (ὑπέρθυρον), linteau, corniche, frise [d’une porte] : Vitr. Arch. 4, 6, 2.