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Definition of roentgenium noun from the Oxford Advanced American Dictionary

 

roentgenium

 noun
noun
NAmE//rɛntˈɡɛniəm//
 
, NAmE//rʌntˈɡɛniəm//
 
, NAmE//rɛntˈdʒɛniəm//
 
, NAmE//rʌntˈdʒɛniəm//
 
[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 Learner's Dictionary entry: roentgenium