Sauna

n. Finnish hot steam bath; room or building containing a steam bath

A sauna (IPA pronunciation: or , Finnish ) is a small room or house designed as a place to experience dry or wet heat sessions, or an establishment with one or more of these and auxiliary facilities. These facilities derive from the Finnish sauna. The word sauna is also used metaphorically to describe an unusually hot or humid environment.
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Sauna, n full-body dry heat treatment. Benefits include relaxation, perspiration, and cleansing. See also thermotherapy. [more]Sauna - Community and Resources

Noun
1. a Finnish steam bath; steam is produced by pouring water over heated rocks
(synonym) sweat room
(hypernym) steam bath, steam room, vapor bath, vapour bath

n. sauna, Finnish hot steam bath, sudatorium, room or building containing a steam bath, sweating room