Definition of sauna noun from the Oxford Advanced American Dictionary

 

sauna

 noun
noun
NAmE//ˈsɔnə//
 
, NAmE//ˈsaʊnə//
 
 
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a period of time in that you sit or lie in a room (also called a sauna) which has been heated to a very high temperature. Some saunas involve the use of steam a hotel with a swimming pool and sauna to have/take a sauna
See the Oxford Advanced Learner's Dictionary entry: sauna