kurchatoviumPronunciation: /ˌkəːtʃəˈtəʊvɪəm/Definition of kurchatovium noun [mass noun] historical a name proposed in the Soviet Union for the artificial radioactive element of atomic number 104, now called rutherfordium. Origin: 1960s: named after Igor V. Kurchatov (1903–60), Russian nuclear physicistkurchatovium in other Oxford dictionaries Definition of kurchatovium in the US English dictionary