polonium

 
Pronunciation: /pəˈləʊnɪəm/

noun

[mass noun]
  • the chemical element of atomic number 84, a radioactive metal occurring in nature only as a product of radioactive decay of uranium. (Symbol: Po)

Origin:

late 19th century: modern Latin, from medieval Latin Polonia 'Poland' (the native country of Marie Curie, the element's co-discoverer)