string theory string telephone • string tie · · · Info · Definitions · Characters · · string theory · · Text Common · · Latin · · Scripts 13 · · Length 4 · · Syllables Definitions · · · (noun) (particle physics) a theory that postulates that subatomic particles are one-dimensional strings. Synonyms: string theory. · · Noun Definition 1 Characters · · space U+0020 e latin small letter e U+0065 g latin small letter g U+0067 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074 y latin small letter y U+0079