sauna

noun

small room or building designed as a place to experience dry or wet heat sessions

Pronunciation: /ˈsɔː.nə/ / /ˈsaʊ.nə/ / /ˈsɑː.nə/

Etymology: Borrowed from Finnish sauna. Doublet of stack.

A room or a house designed for heat sessions.
“The hotel has a sauna in the basement.”
“Of course, it will never get -100 here like it does in Antarctica, but a 300-degree swing was still theoretically possible on a record-cold Minnesota morning–if we got the sauna hot enough.”
The act of using a sauna.
“John had a sauna after his swim.”
“Joanne went for a sauna after her swim.”
In some countries, a business with bath-like facilities that is actually a brothel or a place for (non-commercial) sexual encounters; a bathhouse or massage parlour.
“McPhail ran Maitland's brothels—knocking-shops in Maryhill, Riddrie, Dennistoun, and the more upscale saunas in the West End and city centre.”
A very hot place or room.

Etymology: Borrowed from Finnish sauna. Doublet of stack.

To use a sauna.
““I find it disgusting,” she said. “It would be a total no-no to go to a sauna in Austria with your bathing suit, and an insult to wear workout clothes.” She now saunas at home.”