a combining form meaning “bone,” used in the formation of compound words: osteometry.
Also, especially before a vowel, oste-.

< Greek, combining form of ostéon

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World English Dictionary
osteo- or (before a vowel) oste-
combining form
indicating bone or bones: osteopathy
[from Greek osteon]
oste- or (before a vowel) oste-
combining form
[from Greek osteon]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

comb. form meaning "bone," from Gk. osteon "bone" (see osseous).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

osteo- or oste-
Bone: osteoarthritis.

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