/ Dictionary / Index O open-hearth: Meaning and Definition of Find definitions for: o•pen-hearth Pronunciation: (ō'pun-härth'), [key] — adj. noting, pertaining to, or produced by the open-hearth process. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: open-hearth (Thesaurus) open-hearted open-hearth process Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language