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Webster's 1913 Dictionary

RADIOTHORIUM

RADIOTHORIUM Ra `di *o *tho "ri *um, n. (Chem. )

 

Defn: A radioactive substance apparently formed as a product from thorium.

 

Duden Dictionary

Radiothorium

Ra dio tho ri um Substantiv, Neutrum , das |Radioth o rium |das Radiothorium; Genitiv: des Radiothoriums Element aus der radioaktiven Zerfallsreihe des Thoriums