Definition of ionium
: a natural radioactive isotope of thorium having a mass number of 230
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Origin and Etymology of ionium
ion; from its ionizing action
First Known Use: 1907
Medical Dictionary
ionium
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noun
io·ni·um
\ī-ˈō-nē-əm\
Medical Definition of ionium
: a natural radioactive isotope of thorium having a mass number of 230
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Britannica.com: Encyclopedia article about ionium
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