open-hearth

adjective
\ ˌō-pən-ˈhärth How to pronounce open-hearth (audio) \

Definition of open-hearth

: of, relating to, involving, or produced in the open-hearth process open-hearth steel

First Known Use of open-hearth

1870, in the meaning defined above

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The first known use of open-hearth was in 1870

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