noun, plural Otos (especially collectively) Oto.
a member of a Siouan-speaking tribe of North American Indians who formerly inhabited the lower Missouri River basin and now live in Oklahoma.
Also, Otoe.
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a combining form meaning “ear,” used in the formation of compound words: otology.
Also, especially before a vowel, ot-.

< Greek ōto-, combining form of oûs ear1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
oto- or (before a vowel) ot-
combining form
indicating the ear: otitis; otolith
[from Greek ous, ōt- ear]
ot- or (before a vowel) ot-
combining form
[from Greek ous, ōt- ear]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

oto- or ot-
Ear: otology.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


North American Indian people of the Chiwere branch of the Siouan linguistic family, which also includes the closely related Missouri and Iowa tribes. In their historic past the Oto, together with the Iowa and the Missouri, separated from the Ho-Chunk and moved southwest. In 1673, when met by the Jacques Marquette expedition, they were living some distance up the Des Moines River in present-day Iowa. By 1804 they were living near the mouth of the Platte River. In 1830 they ceded all their land in Missouri and Iowa to the United States government and ultimately sold off their remaining land in Kansas and Nebraska. In 1882 they were removed to Indian Territory (present-day Oklahoma)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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