uranium 238 uranium 235 • uranium glass · · · Info · Definitions · Characters · · uranium 238 · · Text Common · · Latin · · Scripts 11 · · Length 11 · · Syllables Definitions · · · (noun) the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239. Synonyms: uranium 238. · · Noun Definition 1 Characters · · space U+0020 2 digit two U+0032 3 digit three U+0033 8 digit eight U+0038 a latin small letter a U+0061 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E r latin small letter r U+0072 u latin small letter u U+0075