Found 1 items, similar to plutonium.
English → English (WordNet) Definition: plutonium plutonium n : 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 [syn: Pu, atomic number 94 ]