sauna /ˈsɔː.nə/noun 4verb 1forms 3 noun4 •A room or a house designed for heat sessions.The hotel has a sauna in the basement. •The act of using a sauna.John had a sauna after his swim.Joanne went for a sauna after her swim. •(informal, figurative) A very hot place or room. •(euphemistic) 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. — 2022 verb1 •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. — 2026 formssaunaed · saunaing · saunas