POLONIUM
\pəlˈə͡ʊni͡əm], \pəlˈəʊniəm], \p_ə_l_ˈəʊ_n_iə_m]\
Definitions of POLONIUM
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a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor
By Princeton University