'apodyterium' originates from Latin, specifically the word 'apodyterium,' ultimately from Greek 'apodytērion' (ἀποδυτήριον), where 'apo-' meant 'away' and the root related to 'to undress' (from the verb meaning 'to strip off clothes').

'apodyterium' changed from the Greek word 'apodytērion' into Latin as 'apodyterium' and was later borrowed into English with little change in form.

Initially, it meant 'the place for undressing (in a bath),' and over time it retained this specialized meaning, now used chiefly in historical, archaeological, or classical contexts.