o'pen-hearth' proc"ess

a process of steelmaking in which the charge is laid in a furnace (o'pen-hearth' fur"nace) on a shallow hearth and heated directly by burning gas as well as radiatively by the furnace walls.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

open-hearthopen-heart surgery
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