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Abbreviations: O

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Abbreviation	Meaning
obj.	object, objective
obl.	oblique
obs.	obsolete
Obs.	obsolete
Obstet.	obstetrics
Obstetr.	obstetrics
Obstetr. Med.	obstetric medicine
occas.	occasionally
Oceanogr.	oceanography
O.E.	Old English
OE.	Old English
OF.	Old French
OFr.	Old French
OFris.	Old Frisian
OHG.	Old High German
OIr.	Old Irish
ON.	Old Norse
ONF.	Old Northern French
Ophthalm.	ophthalmology
Ophthalmol.	ophthalmology
opp.	opposed (to), the opposite (of)
Opt.	optics
Org. Chem.	organic chemistry
Organ. Chem.	organic chemistry
orig.	origin(al)(ly)
Orkn.	Orkney
Ornith.	ornithology
Ornithol.	ornithology
Orthogr.	orthography
OS.	Old Saxon
OSl.	Old (Church) Slavonic
O.T.	Old Testament
OTeut.	Old Teutonic
Oxf.	Oxford

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