Oto oto • otoantritis · · · Info · Definitions · Characters · · Oto · · Text Latin · · Script 3 · · Length 2 · · Syllables Definitions · · · (noun) a member of the Siouan people inhabiting the valleys of the Platte and Missouri rivers in Nebraska. Synonyms: Otoe. · · Noun Definition 1 (noun) a dialect of the Chiwere language spoken by the Oto. Synonyms: Otoe. · · Noun Definition 2 Characters · · O latin capital letter o U+004F o latin small letter o U+006F t latin small letter t U+0074