a combining form meaning “eye,” used in the formation of compound words: ophthalmology.
Also, especially before a vowel, ophthalm-.

< Greek, combining form of ophthalmós

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World English Dictionary
ophthalmo- or (before a vowel) ophthalm-
combining form
indicating the eye or the eyeball: ophthalmoscope
[from Greek ophthalmoseye1]
ophthalm- or (before a vowel) ophthalm-
combining form
[from Greek ophthalmoseye1]

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

ophthalmo- or ophthalm-
Eye; eyeball: ophthalmoscope.

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