O


Meaning of O in English

n.

Etymology: Greek, thematic vowel of many nouns and adjectives in combination

― used as a connective vowel orig. to join word elements of Greek origin and now also to join word elements of Latin or other origin <speed o meter> <elast o mer>

Merriam Webster Collegiate English Dictionary.      Merriam Webster - Энциклопедический словарь английского языка.