Definitions for uranium 238
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Random House Webster's College Dictionary
uranium 238(n.)
the radioactive uranium isotope having a mass number of 238, used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239.
Category: Chemistry
Origin of uranium 238:
1940–45
Princeton's WordNet
uranium 238(noun)
the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239
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