Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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arc furnace an electric furnace in which heat is produced by an arc formed between the material being heated and an electrode, or between two electrodes.
blast furnace a large, vertical furnace in which metal, esp. iron, is smelted from ore by means of heat intensified by a blast of air forced in at the bottom.
solar furnace a furnace for heating, smelting, and the like, that uses a parabolic reflector to focus solar rays.