From Middle English theater, from Old French theatre, from Latin theatrum, from Ancient Greek θέατρον (théatron, “a place for viewing”), from θεάομαι (theáomai, “to see”, “to watch”, “to observe.”) [Definition from the Wiktionary.]
Alright, here are two more – but then that’s it: Evil Wealth of Raiment: Deadly Πέπλοι in Greek Tragedy by Mireille M Lee and James R. Hamilton’s Philosophy of Theater.
Now go watch some movies for Dionysos – or better yet, see a play!