(1)a room that can be filled with steam in which people bathe; `vapour bath' is a British term
(2)入浴用の蒸気で満たされる部屋
(3)you sweat in a steam room before getting a rubdown and cold shower
(4)蒸気で満ちた浴室の中で汗をかいたのち、汚れをこすり落として冷たいシャワーを浴びる