Definition of Heroult
: an arc furnace that heats both by radiation and by resistance of the bath and is used for making electric steel The first ASM Historical Landmark Award was presented in 1972, marking the site of the first Heroult-type, electric steel-making furnace in the Western Hemisphere. — George Krauss, Advanced Materials & Processes, 1 Mar. 2009 —formerly a U.S. registered trademark —called also Hall-Heroult
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