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Definition of furnace:

  1. A place or time of punishment, affiction, or great trial; severe experience or discipline.
  2. An inclosed place in which heat is produced by the combustion of fuel, as for reducing ores or melting metals, for warming a house, for baking pottery, etc.; as, an iron furnace; a hot- air furnace; a glass furnace; a boiler furnace, etc.
  3. To throw out, or exhale, as from a furnace; also, to put into a furnace.


basic oxygen furnace, reduction furnace, forge, smithy, stove, annealing furnace, BOF, hot-water furnace, open-hearth furnace, steam furnace, hot-air furnace, gas furnace, oil burner, boiler, electric furnace, heating system.

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