What is the name of the room in a bathhouse designed for hot baths?

The room in a bathhouse specifically designed for hot baths is referred to as the Calidarium. This area was heated and maintained at a high temperature, allowing bathers to enjoy a steamy environment that was beneficial for relaxation and cleansing the body. The heat was often supplied by a hypocaust system, which circulated hot air beneath the floors and through the walls. The Calidarium played an essential role in Roman bathing culture, providing not only physical warmth but also a social space for people to gather and relax.

In contrast, the Frigidarium was utilized for cold baths and was generally found in close proximity to the Calidarium in a typical Roman bath complex. The Palaestra was an outdoor exercise area where physical activities took place, and the Hypocaust system was the specific architectural feature that enabled the heating of the baths. Thus, the Calidarium stands out as the essential room for hot baths within the overall design of Roman bathhouses.