caldarium ( synonym found)
Definition of caldarium:

(n) : in Roman baths, the hottest room, with a plunge-pool. It preceded the tepidarium and frigidarium; in modern spas, a room with a hot floor
Definition of caldarium:

(n) : in Roman baths, the hottest room, with a plunge-pool. It preceded the tepidarium and frigidarium; in modern spas, a room with a hot floor
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