list of medical abbreviations: o list of medical abbreviations: o medical abbreviations ← previous page of list (n) next page of list (p) → 0–9 a b c d e f g h i j k l m n o p q r s t u v w x y z latin abbreviations prescription abbreviations acronyms in healthcare abbreviations for medical organisations and personnel abbreviations for diseases and disorders sortable table abbreviation meaning onothing o2oxygen oaosteoarthritis oaboveractive bladder oafosteoclast activating factor oboccult blood ob ob-gyn ob-gyneobstetrics and gynecology obloblique obsorganic brain syndrome occoccasional ocdobsessive-compulsive disorder ocgoral cholecystogram ocnaorthopedic clinics of north america ocporal contraceptive pill octoptical coherence tomography odonce daily (from latin omne in die) right eye (from latin oculus dexter) overdose occupational disease odevery day, usually regarded as once daily (from latin omni die). sometimes written in lowercase. odcornithine decarboxylase oeotitis externa o/eon examination ofcorbitofrontal cortex ogttoral glucose tolerance test ohloral hairy leukoplakia ohsobesity hypoventilation syndrome ohtorthotopic heart transplantation ointointment omotitis media omevery morning (from latin omni mane). generally written in lowercase. omeotitis media with effusion (fluid in the inner ear without other symptoms) oms opsoclonus-myoclonus syndrome onevery night (from latin omni nocte). generally written in lowercase. o/novernight oobout of bed opoutpatient department osteoporosis o&pova and parasites opat outpatient parenteral antibiotic therapy opdoutpatient department opptoriented to person, place, and time opvoutpatient visit oroperating room (aka operating theatre) odds ratio orifopen reduction internal fixation orsaoxacillin-resistant staphylococcus aureus ortoral rehydration therapy osleft eye (from latin oculus sinister) orthopedic surgery overall survival osaobstructive sleep apnea oshoutside hospital osmosmolarity osteoosteomyelitis otoccupational therapy otcover-the-counter drug otdout the door (discharged) otpporiented to time, place, and person ottrorgan transplant tracking record ouboth eyes (from latin oculi uterque) ovoffice visit (see ambulatory care) ozounce