little sioux river little rock • little sister · · · Info · Definitions · Characters · · little sioux river · · Text Common · · Latin · · Scripts 18 · · Length 6 · · Syllables Definitions · · · (noun) a river that rises in southwestern Minnesota and flows southwestward to the Missouri River in western Iowa. Synonyms: Little Sioux River. · · Noun Definition 1 Characters · · space U+0020 e latin small letter e U+0065 i latin small letter i U+0069 l latin small letter l U+006C 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 u latin small letter u U+0075 v latin small letter v U+0076 x latin small letter x U+0078