en.wiktionary.orgреактив - Wiktionary, the free dictionary From Wiktionary, the free dictionary IPA(key): [rʲɪɐkˈtʲif] реакти́в • (reaktív) m inan (genitive реакти́ва, nominative plural реакти́вы, genitive plural реакти́вов) agent, reagent (active power or cause)