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thorium

DEFINITIONS OF: thorium

1

n 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

Synonyms:
Th, atomic number 90
Types:
radiothorium, thorium-228
radioactive isotope of thorium with mass number 228
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.
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