radiopaqueEnglishOxford New American Dictionaryradiopaque /ˌrādēōˈpāk, ˌreɪdioʊˈpeɪk / ▸ adjective (of a substance) opaque to X-rays or similar radiation: radiopaque stones in both kidneys. – DERIVATIVES radiopacity /ˌrādēōˈpasədē/ noun