Tepidarium is a term typically used to describe a warm room in a spa or bathhouse. This space is designed to promote relaxation and physical comfort, and may be used for hot or lukewarm bathing and relaxation. Synonyms for tepidarium might include terms like spa, bathhouse, sauna, steam room, or hot tub. Other potential synonyms might include words like warm pool, relaxation area, hydrotherapy room, or wellness oasis. Ultimately, the term tepidarium refers to a specific type of space designed for relaxation and rejuvenation, and can be used in a variety of different contexts depending on the specific location or facility.