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1. Oxford American Dictionary

   plutonium

   • IPA[plo͞oˈtōnēəm]

   美式

   • n.
     the chemical element of atomic number 94, a dense silvery radioactive metal of the actinide series, used as a fuel in nuclear reactors and as an explosive in nuclear fission weapons. Plutonium only occurs in trace amounts in nature but is manufactured in nuclear reactors from uranium-238.

   • noun: plutonium

2. • 更多解釋

   plutonium

   • IPA[pluːˈtəʊnɪəm]

   英式

   • n.
     the chemical element of atomic number 94, a dense silvery radioactive metal of the actinide ...

   Oxford Dictionary