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



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 Originlate 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