°An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath, as illustrated by the ancient Roman
hypocaustum, and the traditional Korean
ondol (
온돌,
溫突).
°An underfloor heating system, even without such an underfloor space or flue, as adapted to the modern housing, east and west.
synonyms:
hippocaust, floor, heating, underfloor