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Hypocaust
Hypocaust Hyp"o*caust, n. [L. hypocaustum, Gr. ?; ? under + ?
to burn: cf. F. hypocauste.] (Anc. Arch.)
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.
Meaning of Hypocausts from wikipedia