| NOUN | substance | atomic number 94, plutonium, Pu | a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons |
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| Meaning | A solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; 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. | |
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| Synonyms | plutonium, Pu | |
| Narrower | plutonium 239 | A highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel |
| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| Spanish | número atómico 94, plutonio, Pu, pus | |
| Catalan | número atòmic 94, plutoni, Pu, pus | |
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