Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun radiothorium

1 sense of radiothorium

Sense 1
thorium-228, radiothorium -- (radioactive isotope of thorium with mass number 228)
       => thorium, Th, atomic number 90 -- (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)