-o- connective vowel originating in the -o- of Gr. comb. forms (often having adv. force), e.g. (from Gr.) aero-, cyclo-, geo-, hydro-, philo-, pseudo-, and (on L. bases) oleo-, radio- a special class is that of comp. proper names as Anglo-Saxon, Finno-Ugrian, Sino-Japanese. It appears regularly before -CRACY, -GRAPHY, -LOGY, -METER, and so forms stable suffixes with them, e.g. mobocracy, sexology, sociology, foolometer.
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