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.

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. 2019