/ Thesaurus / O Synonyms of open hearth Find synonyms for: Adjective1. open-hearthusage: of or relating to or produced by the open-hearth process; "open-hearth steel"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language