Heroult

noun

He·​roult

(ˈ)ā¦rü

plural Heroults

: 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

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now