HyperDic: uranium_238

English > 1 sense of the expression uranium 238:
NOUNsubstanceuranium 238the commonest isotope of uranium
English > uranium 238: 1 sense > noun 1, substance
MeaningThe commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239.
Broaderuranium, U, atomic number 92A heavy toxic silvery-white radioactive metallic element

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