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| 1. | [ noun ] (chemistry) a radioactive transuranic element that is similar to uranium; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239 | |
| Synonyms: | atomic_number_94 plutonium | |
| Related terms: | chemical_element plutonium_239 | |
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