Lewis & Short

ĕpiscēnĭum, ii, n., = ἐπισκήνιον, a portion of a theatre, the story over the stage, Vitr. 7, 5, 5; called, also, ĕpiscēnos = ἐπίσκηνος, id. 5, 7, 3; cf. Müller’s Archäol. d. K. § 289.