SkyfireDict

plutonium   (TTS Sound)

The noun plutonium has 1 sense

• plutonium, Pu, atomic number 94 -- (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)