nuclear fuel nuclear fission • nuclear fusion · · · Info · Definitions · Characters · · nuclear fuel · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) fuel (such as uranium) that can be used in nuclear reactors as a source of electricity. Synonyms: nuclear fuel. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 l latin small letter l U+006C n latin small letter n U+006E r latin small letter r U+0072 u latin small letter u U+0075