hypocaust
(noun)
noun
1. An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.
2. An underfloor heating system, even without such an underfloor space or flue, as adapted for modern housing.
(noun)
1. An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.
2. An underfloor heating system, even without such an underfloor space or flue, as adapted for modern housing.