Inherited from Middle Russian купоросъ (kuporos) (att. since 1582), from a Western European source like Middle French couperose (Russia didn't trade directly with France in the 16th century, making some intermediary likely), from Old French coperose (whence English copperas), from Latin cuprum (“copper”) and rosa (“rose”), likely calquing Ancient Greek χάλκανθον (khálkanthon, “solution of copper sulfate”).
купоро́с • (kuporós) m inan (genitive купоро́са, nominative plural купоро́сы, genitive plural купоро́сов)
| singular | plural | |
|---|---|---|
| nominative | купоро́с kuporós |
купоро́сы kuporósy |
| genitive | купоро́са kuporósa |
купоро́сов kuporósov |
| dative | купоро́су kuporósu |
купоро́сам kuporósam |
| accusative | купоро́с kuporós |
купоро́сы kuporósy |
| instrumental | купоро́сом kuporósom |
купоро́сами kuporósami |
| prepositional | купоро́се kuporóse |
купоро́сах kuporósax |