What term is used for a warm bath room in Roman baths?

The term for a warm bath room in Roman baths is the tepidarium. In the context of Roman bathhouses, the tepidarium was designed to offer a moderate temperature, serving as a transition space between the hot caldarium and the cold frigidarium. This room typically featured heated walls and floors, allowing bathers to acclimate their bodies gradually to the various temperature changes. The tepidarium was essential for relaxation and preparing the body for the more intense heat of the caldarium or the refreshing cold of the frigidarium.

The other terms represent different types of areas within the baths. The caldarium was the hot bath room, often very steamy and hot, while the frigidarium was the cold bath room, designed to shock the body with cold water. The unctorium typically referred to a room where bathers would be anointed with oils, rather than directly related to bathing temperatures.