Chernobyl Syllabification: (Cher·no·byl)Pronunciation: /CHirˈnōbil, CHərˈnōbəl/Definition of Chernobyl a town near Kiev in Ukraine where an accident at a nuclear power station in April 1986 resulted in serious radioactive contamination in Ukraine, Belarus, and other parts of Europe. Chernobyl in other Oxford dictionaries Definition of Chernobyl in the British & World English dictionary