Found 24,138 abbreviations starting with O:

O&P

Ova and Parasite

Medical » Physiology

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O&P

Operations and Procedures

Governmental » NASA

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O&R

Overhaul and Repair

Governmental » NASA

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O&S

Operations and Support

Governmental » Military

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O'CLOCK

Of the Clock

Miscellaneous

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O'er

Over (As in, "O'er yonder lay the green fields of home.")

Miscellaneous

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O+

Female

Internet » Emoticons

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O+I

Outings and Innings

Academic & Science » Universities

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O->

Male

Internet » Emoticons

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O-CONUS

Outside Continental United States

Governmental » Military

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O-Day

Off-Load Day

Governmental » Military

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O-EA

O-flex Energy Absorbing

Business » Products

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O-M

opsoclonus-myoclonus

Medical » Physiology

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O-MaSE

Organization-based Multi-agent System Engineering

Computing » Software

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O-NAV

Onboard Navigation

Governmental » NASA

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o-t-c

over-the-counter

Medical » Prescription

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O.A.

Order of Australia

Regional » Australian

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O.A.M.

Medal of the Order of Australia

Regional » Australian

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O.C.G.A.

Official Code of Georgia Annotated

Community » Educational

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O.D.

Doctor of Optometry

Academic & Science » Academic Degrees

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O.M.D./D.O.M

Oriental Medical Doctor / Doctor or Oriental Medicine

Medical » Prescription

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O.O

Surprised. Confused. Shocked.

Internet » Emoticons

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O.o

Confusion

Internet » Emoticons

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O.O.D.

Operations Officer of the Day

Governmental » Military

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O.P.

osmotic pressure

Medical » Physiology

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