English

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

 

polonium

 noun
noun
BrE BrE//ˈləʊniəm//
 
; NAmE NAmE//ˈloʊniəm//
 
[uncountable] (symbol Po)
 
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a chemical element. Polonium is a radioactive metal that is present in nature when uranium decays. Word Origin late 19th cent.: modern Latin, from medieval Latin Polonia ‘Poland’ (the native country of Marie Curie, the element's co-discoverer).
See the Oxford Advanced American Dictionary entry: polonium