HyperDic

English > 1 sense of the word radiothorium:
NOUNsubstanceradiothorium, thorium-228radioactive isotope of thorium with mass number 228
English > radiothorium: 1 sense > noun 1, substance
Meaningradioactive isotope of thorium with mass number 228.
Synonymthorium-228
Broaderthorium, Th, atomic number 90A soft silvery-white tetravalent radioactive metallic element