/ Thesaurus / R Synonyms of radio opaque Find synonyms for: Adjective1. radiopaque (vs. radiolucent), radio-opaqueusage: not transparent to X-rays or other forms of radiation; "barium sulfate is radiopaque"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: coincidence Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language