Index:Abbreviations/O
- OE.
- Old English
- OGI,
- v. II
- OHG.
- Old High German
- OIr.
- Old Irish
- O.Pers.
- Old Persian.
- obj.
- object.
- Od.
- Odyssey
- oft.
- often
- onomat.
- onomatopoeic.
- opp.
- opposed to
- opt.
- optative
- Orac.
- Oraculum
- Orat.Att.
- J. G. Baiter and H. Sauppe, Oratores Attici, Zurich 1845–50 [Hildesheim 1967]
- orat.obliq.
- oratio obliqua
- Oratt.
- Oratores Attici
- Orchom.
- Orchomenos
- orig.
- originally
- Osc.
- Oscan
- Ostr.,
- v. III
- Ostr.Strassb.,
- v. III
- ostr.
- ostracon. (For Ostr. v. index III).
- Oxy.
- POxy., q.v. (III)
- oxyt.
- oxytone