Openhearth

open-hearth

[oh-puhn-hahrth]
adjective
noting, pertaining to, or produced by the open-hearth process.

Origin:
1880–85

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
open-hearth

adjective
of or relating to or produced by the open-hearth process; "open-hearth steel" 
WordNet® 3.0, © 2006 by Princeton University.
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