UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/pəˈləʊnɪəm/US:USA pronunciation: respellingUSA pronunciation: respelling(pə lōnē əm)

WordReference Random House Unabridged Dictionary of American English © 2020
po•lo•ni•um  (pə lōnē əm),USA pronunciation n. [Chem.]
  1. Chemistrya radioactive element discovered by Pierre and Marie Curie in 1898;
    Symbol: Po;
    at. no.: 84;
    at. wt.: about 210.
  • Medieval Latin Polonia Poland) + -ium -ium
  • Neo-Latin, equivalent. to polon- (
  • 1895–1900

Collins Concise English Dictionary © HarperCollins Publishers::
polonium /pəˈləʊnɪəm/ n
  1. a very rare radioactive element that occurs in trace amounts in uranium ores. The isotope polonium-210 is produced artificially and is used as a lightweight power source in satellites and to eliminate static electricity in certain industries. Symbol: Po; atomic no: 84; half-life of most stable isotope, 209Po: 103 years; valency: –2, 0, 2, 4, or 6; relative density (alpha modification): 9.32; melting pt: 254°C; boiling pt: 962°C
Etymology: 19th Century: New Latin, from Medieval Latin Polōnia Poland; named in honour of the Polish nationality of its discoverer, Marie Curie
'polonium' also found in these entries (note: many are not synonyms or translations):

Report an inappropriate ad.