radiothorium
ra·diot·ho·rium
noun
1.
radioactive isotope of thorium with mass number 228
Origin
From radio- + thorium.
Related words
Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.