4 definitions found From WordNet (r) 2.0 [wn]: Pu noun: 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: {plutonium}, {atomic number 94}] From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]: PU Physical Unit (NAU) From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]: PU Power Unit From Virtual Entity of Relevant Acronyms (Version 1.9, June 2002) [vera]: PU Processing Unit

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