WordReference Random House Unabridged Dictionary of American English © 2026
uranium 238, [Chem.]
  1. Chemistrythe 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. Also called U-238, U 238. 
  • 1940–45

'uranium 238' also found in these entries (note: many are not synonyms or translations):
U-238 - dirty bomb - fertile - plutonium - uranium 239 - uranium series

Forum discussions with the word(s) "uranium 238" in the title:


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