bĭcămĕrātus — Lewis & Short
bĭcămĕrātus, a, um, adj.bis-camera,
I with a double vault, doubly arched:
cella,Hier. ad Jovin. 1, 17: ecclesia, Aug. Civ. Dei, 15, 26.—As subst.: bĭcămĕrātum, i, n., a receptacle with two compartments, Ambros. Hexaëm. 6, 9, 72.