vapor bath

GNU Webster's 1913

1. n. (Chem.) A small metallic drying oven, usually of copper, for drying and heating filter papers, precipitates, etc.; -- called also air bath. A modified form is provided with a jacket in the outside partition for holding water, or other volatile liquid, by which the temperature may be limited exactly to the required degree.

WordNet 3.0

1. n. a room that can be filled with steam in which people bathe; `vapour bath' is a British term
2. n. you sweat in a steam room before getting a rubdown and cold shower