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radioactinium

[rey-dee-oh-ak-tin-ee-uh m] /ˌreɪ di oʊ ækˈtɪn i əm/
noun, Chemistry
1.
the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227.
Origin
1905-1910
1905-10; radio- + actinium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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