κεραυνοσκοπεῖον
From LSJ
τὸ γὰρ μυστήριον ἤδη ἐνεργεῖται τῆς ἀνομίας· μόνον ὁ κατέχων ἄρτι ἕως ἐκ μέσου γένηται. (2Thess 2:7) → For the mystery of lawlessness is already at work — just at work until the one who is now constraining it is taken out.
English (LSJ)
τό,
A machine for making thunder on the stage, Poll.4.127,130.
German (Pape)
[Seite 1423] τό, nach Poll. 4, 127. 130 im Theater die Donnermaschine, auf einer hohen Warte.
Greek (Liddell-Scott)
κεραυνοσκοπεῖον: τό, μηχαναὶ πρὸς παραγωγὴν κεραυνῶν ἐπὶ τῆς σκηνῆς, Πολυδ. Δ΄, 127 καὶ 130.