Teton Tethys • tetra · · · Info · Definitions · Characters · · Teton · · Text Latin · · Script 5 · · Length Definitions · · · (noun) a member of the large western branch of Sioux people which was made up of several groups that lived on the plains. Synonyms: Lakota, Teton Sioux, Teton Dakota. · · Noun Definition 1 Characters · · T latin capital letter t U+0054 e latin small letter e U+0065 n latin small letter n U+006E o latin small letter o U+006F t latin small letter t U+0074