| uranium 238 n. The most common isotope of uranium, having mass number 238 and half-life 4.46 × 109 years, nonfissionable but irradiated with neutrons to produce fissionable plutonium 239. |
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| Noun | 1. |  uranium 238 - the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239atomic number 92, uranium, U - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons |
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