uranium 238

  1. the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239.

Origin of uranium 238

First recorded in 1940–45
  • Also called U-238, U 238.

Words Nearby uranium 238

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024