-o-

-o-

the typical ending of the first element of compounds of Greek origin (as -i-, is, in compounds of Latin origin), used regularly in forming new compounds with elements of Greek origin and often used in English as a connective irrespective of etymology: Franco-Italian; geography; seriocomic; speedometer.
Compare -i-.


Origin:
Middle English (< Old French) < Latin < Greek

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-o-
 
connective vowel
Compare -i- used to connect elements in a compound word: chromosome; filmography
 
[from Greek, stem vowel of many nouns and adjectives in combination]

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

-o-
Used as a connective to join word elements: acidophilic.

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