Definitions for open-hearth
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Random House Webster's College Dictionary
o′pen-hearth′(adj.)
noting, pertaining to, or produced by the open-hearth process.
Category: Metallurgy
Origin of open-hearth:
1880–85
Wiktionary
open-hearth(Adjective)
Describing a reverberatory furnace used to make high-quality steel
open-hearth(Adjective)
Designating the steel so produced
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"open-hearth." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/open-hearth>.