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RADIOACTINIUM Definition & Meaning | Dictionary.com

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radioactinium

[ rey-dee-oh-ak-tin-ee-uhm ]

noun

Chemistry.
  1. the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. : RdAc, Th 227
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Word History and Origins

Origin of radioactinium1

First recorded in 1905–10; radio- + actinium

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radioacousticsradioactivate

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