Sentence:  In the west wing is the bathing establishment, consisting of anteroom with privies, the apodyterium, the semicircular basin, reached by three steps, the <WSD>vaporium</WSD> with heating pipes for warm and hot baths, and the boiler-room with vaulted furnace. 
Meaning of the word marked with <WSD> tags:  A steam bath (room for taking steam baths).