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Definitions of thorium
  1. noun
    a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands

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Definition that contains thorium
  • at a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
  • pitchblende a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
  • thorium-228 radioactive isotope of thorium with mass number 228
  • monazite a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
  • uraninite a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
  • atomic number 85 a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
  • astatine a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium
  • radiothorium radioactive isotope of thorium with mass number 228
  • thoriate impregnate with thorium oxide to increase thermionic emission
  • thorite a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite
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