a combining form meaning “tooth,” used in the formation of compound words: odontology.
Also, especially before a vowel, odont-.
Compare -odont, -odus.

< Greek odont-, stem of odoús or odṓn tooth + -o-

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World English Dictionary
odonto- or (before a vowel) odont-
combining form
indicating a tooth or teeth: odontology
[from Greek odōn tooth]
odont- or (before a vowel) odont-
combining form
[from Greek odōn tooth]

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

odonto- or odont-
Tooth: odontoid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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