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radioactinium
[ rey-dee-oh-ak-tin-ee-uhm ]
/ ˌreɪ di oʊ ækˈtɪn i əm /
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noun Chemistry.
the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227
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Words nearby radioactinium
Radiguet, radii, Radin, radio, radioacoustics, radioactinium, radioactivate, radioactive, radioactive dating, radioactive decay, radioactive series
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023