Definition of roentgenium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌrɒntˈɡiːniəm//
; NAmE NAmE//ˌrentˈɡiːniəm//
[uncountable](symbol Rg)
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a chemical element. Roentgenium is a radioactive element that is produced artificially and has no known use. the discovery and naming of roentgenium Roentgenium has no stable isotopes.
See the Oxford Advanced American Dictionary entry: roentgenium