/ Thesaurus / G Synonyms of geothermic Find synonyms for: Adjective1. geothermal, geothermicusage: of or relating to the heat in the interior of the earthWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language