IPA(key): [ˈnʲeftʲɪj] не́фтей • (néftej) f inan pl genitive plural of нефть (neftʹ)...
(neftʹ) f inan (genitive не́фти, nominative plural не́фти, genitive plural не́фтей, relational adjective нефтяно́й) oil, petroleum, mineral oil 1903, Александр...