資料來源 : pyDict

資料來源 : WordNet®

plutonium
     n : a solid silvery gray radioactive transuranic element  whose
         atoms can be split when bombarded with neutrons; found in
         minute quantities in uranium ores but is usually
         synthesized in nuclear reactors; 13 isotopes are known
         with the most important being plutonium 239 [syn: {Pu}, {atomic
         number 94}]