steambath

/S T IY1 M B AH0 TH/
noun
  1. 1

    A room or building filled with steam, in which people sit and sweat.

  2. 2

    The act of bathing by exposure to steam.

Source: https://en.wiktionary.org/wiki/steam%20bath, https://en.wiktionary.org/wiki/steambath