sauna -
A room or a house designed for heat sessions.
sauna -
An act of using a sauna.
sauna -
A public sauna; a front for a brothel in some countries.
Verb
sauna -
To use a sauna.
Wikipedia
A sauna 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. A sauna session can be a social affair in which the participants disrobe and sit or recline in temperatures typically between 60°C and 100°C. This induces relaxation and promotes sweating.
OmegaWiki Dictionary
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sauna The act of staying in a room with dry heat in which steam is produced in certain intervals by pouring water over hot stones for the purpose of transpiration.
sauna A room, often with wooden walls, which is designed for heating dry air and where steam may be produced by pouring water over hot stones.