oto

noun, plural O·tos, (especially collectively) O·to.

1. a member of a Siouan-speaking tribe of North American Indians who formerly inhabited the lower Missouri River basin and now live in Oklahoma.

1. a combining form meaning “ear,” used in the formation of compound words: otology.

combining form

1. indicating the earotitis; otolith

pref.

1. Ear:otology.