Definition of roentgenium in English:
roentgenium
noun rəːntˈɡɛnɪəmrʌntˈdʒɛnɪəmrɒntˈɡɛnɪəmrentˈɡenēəm
The chemical element of atomic number 111, a radioactive element produced artificially.
Origin
Early 21st century: named after Wilhelm Conrad Röntgen (see roentgen).