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uranium 235

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noun Chemistry.
  1. the radioactive uranium isotope having a mass number of 235, comprising 0.715 percent of natural uranium. When bombarded with neutrons it undergoes fission with the release of energy.
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Origin of uranium 235

First recorded in 1935–40
Also called U-235, U 235, actinouranium.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018