hippocaust

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• hippocaust — noun Hypocaust …   Wiktionary

• hypocaust — noun a) 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). b) An underfloor heating system, even… …   Wiktionary