radiothorium 1
noundomain: substance
Princeton WordNet [ver.3.1]
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EnglishDefinition
radioactive isotope of thorium with mass number 228
Hypernym
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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