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n. A space under the floor of an ancient Roman building where heat from a furnace was accumulated to heat a room or a bath.

n. An underfloor space or flue through which heat from a furnace passes to heat the floor of a room or a bath.

n. An underfloor heating system, even without such an underfloor space or flue, as adapted to the modern housing, east and west.

n. A furnace, esp. one connected with a series of small chambers and flues of tiles or other masonry through which the heat of a fire was distributed to rooms above. This contrivance, first used in bath, was afterwards adopted in private houses.

n. In architecture, an arched fire-chamber, from which heat is distributed through earthenware pipes to the rooms above it. The term is also sometimes applied to a fireplace, furnace, or oven.

"The stube, or stove, of a German inn, derived its name from the great hypocaust, which is always strongly heated to secure the warmth of the apartment in which it is placed."

underfloor    floor    hippocaust    heating   

puddling    ivory-tower    unbreathed    open-hearth    forced-air