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WordNet-Online
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Noun plutonium has 1 sense
- plutonium, Pu, atomic number 94 - a solid silvery gray 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
--1 is a kind of chemical element, element
--1 has particulars: plutonium 239
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