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radiothorium

[rey-dee-oh-thawr-ee-uh m, -thohr-] /ˌreɪ di oʊˈθɔr i əm, -ˈθoʊr-/
noun, Chemistry
1.
a disintegration product of thorium.
Origin
1920-1925
1920-25; < New Latin; see radio-, thorium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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