- a member of a Siouan-speaking tribe of North American Indians who formerly inhabited the lower Missouri River basin and now live in Oklahoma.
- a combining form meaning “ear,” used in the formation of compound words: otology.
Also especially before a vowel, ot-.
Origin of oto-
< Greek ōto-, combining form of oûs ear1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for oto
Swim (v), ni̍huan (an French); same word as in the Oto language.
Mr. Bodmer took the portraits of an Omaha and an Oto Indian.
Near the mouth of Gasconade River we met the Oto steam-boat.
Oto touched his cap and adjusted the sighting apparatus to his shoulder.
Thus far Oto's old friend had seemed to bear a charmed life.
before a vowel ot-
- indicating the earotitis; otolith
from Greek ous, ōt- ear