| plutocracy | (noun) a political system governed by the wealthy people | - |
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| plutocrat | (noun) someone who exercises power by virtue of wealth | - |
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| pluton | (noun) large mass of intrusive igneous rock believed to have solidified deep within the earth | Synonyms: batholite, batholith, plutonic rock |
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| plutonium | (noun) 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 | Synonyms: atomic number 94, Pu |
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