Definition of open-hearth in English:

open-hearth

Syllabification: o·pen-hearth
Pronunciation: /ˌōpənˈhärTH/

Entry from US English dictionary

adjective

Denoting a steelmaking process in which the charge is laid on a hearth in a shallow furnace and heated by burning gas.

Definition of open-hearth in:

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peep surreptitiously