Apodyterium

·noun The apartment at the entrance of the baths, or in the palestra, where one stripped; a dressing room.

apodyterium
ăpŏdȳtērĭum, ii, n., = ἀποδυτήριον, the undressing-room in a bathing-house , * Cic. ad Q. Fr. 3, 1...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
apodyterium
apodȳtērium ī, n , ἀποδυτήριον, an undressing-room (in a bath-house). ...

An Elementary Latin Dictionary