thorium

thorium
[ˈθɔːrɪəm]
noun
  1. [mass noun]the chemical element of atomic number 90, a white radioactive metal of the actinide series(Symbol: Th)
    (化学元素)钍((符号:Th))
  2. Thorium has a variety of industrial uses and is of increasing importance as a nuclear fuel; the dioxide is used as an incandescent material in gas mantles. Thorium is one of the most abundant radioactive elements in the earth's crust and its main source is the mineral monazite
语源
  1. mid 19th cent.: named after the god Thor
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