Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun plutonium_239

1 sense of plutonium 239

Sense 1
plutonium 239 -- (a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons)
       => 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)