What does ob stand for?

Obese

Obiter - Incidentally - Latin (GPO)

Oblong - Bookbinding (WDMC)

Oboe (WDAA)

Obstetrics (SHCU)

Obvious (ADWA)

Opera Buffa - Music (GROV)

Outboard Buffer (SAUS)

Obadiah - Old Testament book

Austrian Airtransport (SAUS)

Brockville Public Library, Ontario - Library symbol - National Library of Canada (NLC)

Brought Over (ROG)

Oberhausen - Rheinland - German license plate city code

Oberlerchner - Joseph Oberlerchner Holzindustrie - Austria - ICAO aircraft manufacturer identifier (ICAO)

Obese - Medicine (EDAA)

Obeum - Nickname for toilets at Cambridge University - Slang - British (DSUE)

Obidiah - Old Testament

Obiit - He, or She, Died - Latin

Obituary Notice (DSUE)

Objection (ROG)

Objective - Microscopy

Objective Benefit (MAE)

Obligation (ROG)

Obligation Bond

Obligatory

Obliteration

Obliterative Bronchiolitis - Medicine (MELL)

Oblong

Oboe

Obolus - Coin - Latin (ADA)

O'Brien Energy & Resources Ltd. - Toronto Stock Exchange symbol

Obscure (KSC)

Observation (WGA)

Observation Balloon (SAUS)

Observed Bearing - Navigation

Obsolete (AABC)

Obstetrician

Obstetrics - Medicine

Obtain - Telegraphy (PCTE)

Obtuse Bisectrix - Crystallography

Occult Bleeding - Medicine

Occupational Behavior

Ocean Beach (SAUS)

Ocean Bottom

Octagon Barrel - Gunnery

Octal-to-Binary - Computer science (BUR)

Octave Band

Off-Broadway (WGA)

Offensive Back - Football

Official Board of Ballroom Dancing - British (BI)

Official Bulletin (SAUS)

Official Bulletin. International Commission for Air Navigation - A publication (DLA)

Official Business (ELAL)

Oil Base (SAUS)

Oil Bearing (DCTA)

Oil Bomb

Oil-Break (SAUS)

Old Babylonian (BJA)

- The Old Bailey - London court

Old Bonded - Whiskey (ROG)

Old Boy - Communications operators' colloquialism

Old Buildings - British Admiralty

Olecranon Bursitis - Medicine (MELL)

Oligoclonal Band - Analytical biochemistry

Ombudsman for Business - Department of Commerce

On Base - Baseball (GOBB)

On Being: the Servant's Servant - A publication (APTA)

On Board

One-Bearing (SAUS)

Opal Air - ICAO designator (AD)

Opening of Books

Operating Base - Navy

Operating Budget (AFM)

Operational Base - Navy

Operation Brotherhood

Operations Branch (HEAS)

Optical Bench (SAUS)

Optometrists' Board - Australian Capital Territory

Or Better - Business term

Ordered Back

Order of Battle - Military

Order of Burma - British military (DMA)

Order of the Bath

Order of the Boer People (SAUS)

Order of the Boer State (SAUS)

Ordnance Battalion - Navy

Ordnance Board - Navy

Oregon Ballet

Organization Blocks (SAUS)

Organized Baseball (NDBD)

Orgelbuechlein - Little Organ Book - Bach - Music

Orientalische Bibliographie - A publication (BJA)

Orlando Bloom - Legolas - Lord of the Rings

Orthodontic Bulletin - Medicine - Journal (EDAA)

Ortsbatterie - Local Battery - German military - World War II

Outboard - NCIC boat propulsion code (NCIC)

Outboard

Outboard Motor - NCIC boat category code (NCIC)

Outbound (WDAA)

Out of Bounds - Sports (GOBB)

Out-of-Business (OICC)

Output Block (SAUS)

Output Buffer - Computer science

Output Bus - Computer science

Outside Broadcast (EY)

Outside Bugs - Nonresident staff at a school - British (DSUE)

Outward Bound (EA)

Over Bath - Classified advertising (ADA)

Overboard (AAG)

Over Bought (SAUS)

Overburden (SAUS)

Overseas Brats - Commercial firm (EA)

Overseas Broadcast - or Broadcasting (IAA)

Owena Bank - Nigeria

Own Brand (MHDB)

Oxford Biographies - A publication

Peru - International civil aircraft marking (ODBW)

Occult Blood Positive - Medicine (DAVI)