[mass noun]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(Symbol: Pu) (化学元素)钚(符号:Pu)
语源
late 18th cent.: from Greek 'Pluto', on the pattern of neptunium, being the next planet beyond Neptune