sauna

Pronunciation: /ˈsɔː.nə/

The English word “sauna” has 5 meanings listed here.

noun

A room or a house designed for heat sessions.
The act of using a sauna.
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.
A very hot place or room.

Borrowed from Finnish sauna. Possibly a doublet of stack.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.