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radiothorium

[rey-dee-oh-thawr-ee-uh m, -thohr-]
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noun Chemistry.
  1. a disintegration product of thorium.
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Origin of radiothorium

From New Latin, dating back to 1920–25; see origin at radio-, thorium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018