| NOUN | substance | plutonium 239 | a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel |
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| Meaning | A highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons. | |
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| Narrower | weapons plutonium, weapons-grade plutonium | plutonium 239 that is recovered when nuclear weapons are disassembled |
| Broader | plutonium, Pu, atomic number 94 | A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons |
| Spanish | plutonio 239 | |
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