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U-239

or U 239

Chemistry.
  1. uranium 239.
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uranium 239

noun Chemistry.
  1. the uranium isotope with a mass number 239. It is artificially produced by the neutron bombardment of uranium 238.
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Also called U-239, U 239.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018