thermonuclear reaction thermonuclear bomb • thermonuclear reactor · · · Info · Definitions · Characters · · thermonuclear reaction · · Text Common · · Latin · · Scripts 22 · · Length 7 · · Syllables Definitions · · · (noun) a nuclear fusion reaction taking place at very high temperatures (as in the sun). Synonyms: thermonuclear reaction. · · 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 h latin small letter h U+0068 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 r latin small letter r U+0072 t latin small letter t U+0074 u latin small letter u U+0075