\ ˌō-pən-ˈhärth
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Definition of open-hearth
: of, relating to, involving, or produced in the open-hearth process
open-hearth steel
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“Open-hearth.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/open-hearth. Accessed 20 Jan. 2022.
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The first known use of open-hearth was in 1870
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