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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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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