radiothorium

noun
ra·​dio·​tho·​ri·​um | \ˌrā-dē-ō-ˈthȯr-ē-əm \

Definition of radiothorium 

: a radioactive isotope of thorium with the mass number 228

First Known Use of radiothorium

1905, in the meaning defined above

History and Etymology for radiothorium

New Latin

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The first known use of radiothorium was in 1905

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radiothorium

noun
ra·​dio·​tho·​ri·​um | \-ˈthōr-ē-əm, -ˈthȯr- \

Medical Definition of radiothorium 

: a radioactive isotope of thorium with the mass number 228

More from Merriam-Webster on radiothorium

Britannica.com: Encyclopedia article about radiothorium

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