thermal bath(redirected from Thermal spa)
1. An open tub used as a fixture for bathing.
2. The room containing the bathtub.
3. (pl.) The Roman public bathing establishments, consisting of hot, warm, and cool plunges, sweat rooms, athletic and other facilities; balnea, thermae.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.