O-


Meaning of O- in English

I. combining form

or oo-

Etymology: Greek ōi-, ōio-, from ōion — more at egg

: egg

oo logy

specifically : ovum

oo gonium

II. abbreviation

orth- or ortho-

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.