arch (subs.) Copy link Outline 1. fornix, ĭcis, m.2. arcus, ūs • arch (subs.): 1. fornix, ĭcis, m.: the Fabian a., Fabius fornix, Cic.: a.s in a wall, fornices in muro, Liv. Fig.: the a.s of the sky, fornices coeli, Enn. (censured by Cic.) 2. arcus, ūs: a low a., humilis a., Ov.: a marble a., marmoreus a., Suet.: Tac.: a black a. of waters (i. e. the curved billows), niger a. aquarum, Ov. Phr.: constructed on a.s, or adorned with them, fornĭcātus: v. arched.--Note. Fornix and arcus are both used in the sense of a triumphal arch, but the epithet triumphalis rarely, if ever, occurs in the classical writers.