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furnace (n.)

early 13c., from Old French fornais "oven, furnace," figuratively "flame of love" (12c.), from Latin fornacem (nominative fornax) "an oven, kiln," related to fornus/furnus "oven," and to formus "warm," from PIE root *gwher- "to heat, warm."

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Definitions of furnace from WordNet

furnace (n.)
an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.;
From wordnet.princeton.edu