plutonium 239 Plutonium • plutonium bomb · · · Info · Definitions · Characters · · plutonium 239 · · Text Common · · Latin · · Scripts 13 · · Length 10 · · Syllables Definitions · · · (noun) 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. Synonyms: plutonium 239. · · Noun Definition 1 Characters · · space U+0020 2 digit two U+0032 3 digit three U+0033 9 digit nine U+0039 i latin small letter i U+0069 l latin small letter l U+006C m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 t latin small letter t U+0074 u latin small letter u U+0075