atomic number 90

Noun
  1. 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 (synset 114682288)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    subtypes: radiothorium, thorium-228 - radioactive isotope of thorium with mass number 228
    substance meronym:
    • monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
    • thorite - a radioactive mineral consisting of thorium silicate; it is a source of thorium that is found in coarse granite
    same as: th, thorium

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