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uranium 235

noun, Chemistry.
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.
Also called U-235, U 235, actinouranium.
Origin of uranium 235
1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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