O agglutinin O antigen O colony O shell O'Beirne O'Beirne sphincter O'Beirne valve O'Dwyer O'Dwyer tube O'Hara O'Hara forceps O'nyong-nyong fever o'nyong-nyong virus o- O-(triethylaminoethyl) cellulose O-acetylcarnitine O-acylcarnitine o-aminobenzoic acid o-chlorobenzalmalononitrile O-diethylaminoethyl cellulose o-diphenolase O-phosphono- O-phosphoserine o-phthalaldehyde O-R system O-succinylhomoserine (thiol)-lyase O.D. o.d. O.U. OA OAC OAE oak apple oari- oasthouse urine disease oat cell oat cell carcinoma oath oatmeal-tomato paste agar OAV syndrome OB OB protein OB/GYN obeliac obeliad obelion Ober test Obermayer Obermayer test Obermeier Obermeier spirillum Obersteiner Obersteiner-Redlich line Obersteiner-Redlich zone obese Obesity Obesity hypoventilation syndrome (OHS) obesity index Obesity Surgery obex obfuscation object object blindness object choice object constancy object glass object libido object relationship objective objective assessment data objective optometer objective perimetry objective probability objective psychology objective sign objective symptom objective synonyms obligate obligate aerobe obligate anaerobe obligate parasite oblique oblique amputation oblique arytenoid muscle oblique auricular muscle oblique bandage oblique bundle of pons oblique cord of interosseous membrane of forearm oblique diameter oblique facial cleft oblique fibers of muscular layer of stomach oblique fissure oblique fissure of lung oblique fracture oblique head oblique illumination oblique lie oblique ligament of elbow joint oblique line oblique line of mandible oblique line of thyroid cartilage oblique muscle of auricle oblique part of cricothyroid (muscle) oblique pericardial sinus oblique pontine fasciculus oblique popliteal ligament oblique projection oblique ridge oblique ridge of crown oblique ridge of trapezium oblique section oblique sinus of pericardium oblique vein of left atrium obliquity obliquus obliquus capitis inferior (muscle) obliquus capitis superior (muscle) obliteration obliterative arachnoiditis obliterative bronchitis obliterative pericarditis oblong fovea of arytenoid cartilage oblong pit of arytenoid cartilage oblongata obnubilation OBS observer Obsession obsessional neurosis obsessive behavior obsessive personality obsessive-compulsive Obsessive-compulsive disorder obsessive-compulsive disorder OCD obsessive-compulsive neurosis obsessive-compulsive personality Obsessive-compulsive personality disorder obsolescence obstacle sense obstetric Obstetric and Gynecologic Surgery obstetric binder obstetric conjugate obstetric conjugate diameter obstetric conjugate of pelvic outlet obstetric fistula obstetric forceps obstetric genital fistula obstetric hand obstetric palsy obstetric paralysis obstetric position obstetric ultrasound Obstetrical Emergencies obstetrician obstetrics OB obstinate obstipation obstruction obstructive appendicitis obstructive dysmenorrhea obstructive hydrocephalus obstructive jaundice obstructive murmur obstructive pneumonia obstructive sleep apnea OSA obstructive sleep apnea syndrome obstructive sleep apnea-hypopnea syndrome obstructive thrombus Obstructive uropathy obstruent obtund obturating embolism obturation obturator obturator appliance obturator artery obturator branch of pubic branch of inferior epigastric artery obturator canal obturator crest obturator externus (muscle) obturator fascia obturator foramen obturator groove obturator hernia obturator internus (muscle) obturator lymph nodes obturator membrane obturator nerve obturator tubercle (anterior and posterior) obturator veins obtuse obtusion OC Occam's razor occipital occipital anchorage occipital angle of parietal bone occipital artery occipital aspect occipital belly of occipitofrontalis muscle occipital bone occipital border occipital border of parietal bone occipital border of temporal bone occipital branch occipital cerebral veins occipital condyle occipital diploic vein occipital emissary vein occipital fontanelle occipital forceps occipital groove occipital gyri occipital horn occipital horn syndrome occipital line occipital lobe occipital lobe epilepsy occipital lobe of cerebrum occipital lymph nodes occipital margin occipital margin of temporal bone Occipital Neuralgia occipital neurectomy occipital neuritis occipital operculum occipital part of corpus callosum occipital plane occipital plexus occipital point occipital pole occipital pole [TA] of cerebrum occipital region of head occipital sinus occipital somite occipital stripe occipital triangle occipital vein occipitalis occipitalis muscle occipitalization occipito- occipitoanterior position OA occipitoatloid occipitoaxial occipitoaxial ligaments occipitobregmatic occipitocollicular tract occipitofacial occipitofrontal occipitofrontal diameter occipitofrontal fasciculus occipitofrontal muscle occipitofrontalis occipitofrontalis (muscle) occipitomastoid occipitomastoid suture occipitomental occipitomental diameter occipitomental projection occipitoparietal occipitopontine fibers occipitopontine tract occipitoposterior position occipitotectal fibers occipitotectal tract occipitotemporal occipitotemporal sulcus occipitothalamic occipitothalamic radiation occipitotransverse position occiput occipitis occlude occluded virus occluder occluding centric relation record occluding frame occluding ligature occluding paper occluding relation occlusal occlusal adjustment occlusal analysis occlusal balance occlusal caries occlusal clearance occlusal correction occlusal curvature occlusal disharmony occlusal embrasure occlusal fissure occlusal force occlusal form occlusal fossa occlusal harmony occlusal imbalance occlusal path occlusal pattern occlusal pearl occlusal pivot occlusal plane occlusal position occlusal pressure occlusal radiograph occlusal rest occlusal rest bar occlusal rim occlusal scheme occlusal surface of tooth occlusal system occlusal table occlusal trauma occlusal vertical dimension occlusal wear occlusion occlusion of pupil occlusion rim occlusive occlusive dressing occlusive ileus occlusive meningitis occlusometer occult occult bleeding occult blood occult border of nail occult carcinoma occult choroidal neovascularization occult cleft palate occult fracture occult hydrocephalus occult papillary carcinoma of the thyroid occult posterior laryngeal cleft Occupational asthma occupational disease Occupational hearing loss Occupational Safety and Health Act Occupational Therapy Occupational Therapy Interviews OCD Oceanospirillum ocellus ocelli ochlophobia Ochoa Ochoa law Ochoa syndrome ochratoxin ochratoxin A ochre codon ochre mutation Ochrobactrum ochrodermia ochrometer ochronosis ochronotic ochronotic arthritis Ochsner Ochsner clamp Ochsner method ocrylate OCT oct- OCTA octacosanoic acid octad octafluoropropane octamethyl pyrophosphoramide OMPA octan octandioic acid octanoate octanoic acid octanoyl-CoA synthetase octapeptide octaploidy octapressin octavalent octavus octi- octo- Octomitidae Octomitus hominis octopamine octose octreotide octulose octulosonic acid ocular ocular albinism ocular albinism type 1 ocular albinism type 2 ocular albinism type 3 ocular ALBINISM with late-onset sensorineural deafness ocular albinism with sensorineural deafness ocular apraxia ocular bobbing ocular cicatricial pemphigoid ocular cone ocular crisis ocular cup ocular dysmetria ocular flutter ocular fundus ocular humor ocular hypertelorism ocular larva migrans ocular larva migrans granuloma ocular lens ocular micrometer ocular migraine ocular motor ocular motor apraxia ocular muscles ocular myiasis ocular myopathy ocular nystagmus ocular onchocerciasis ocular paralysis ocular pemphigoid ocular prosthesis ocular rigidity ocular scoliosis ocular sparganosis ocular tensionTn ocular torticollis ocular vertigo ocular vesicle ocular-mucous membrane syndrome ocularist oculentum oculenta oculi oculist oculo- Oculo-digito-esophagoduodenal syndrome oculoauriculovertebral oculoauriculovertebral dysplasia OAC oculobuccogenital syndrome oculocardiac oculocardiac reflex oculocephalic reflex oculocephalogyric reflex oculocerebrorenal oculocerebrorenal syndrome oculocutaneous oculocutaneous albinism oculocutaneous syndrome oculodentodigital oculodentodigital dysplasia ODD Oculodentodigital Syndrome oculodermal oculodermal melanosis oculodynia oculoencephalic angiomatosis oculofacial oculography oculogravic illusion oculogyral illusion oculogyria oculogyric oculogyric crises oculomandibulodyscephaly oculomandibulofacial syndrome oculomotor oculomotor nerve [CN III] oculomotor nucleus oculomotor response oculomotor root of ciliary ganglion oculomotor sulcus of mesencephalon oculomotor system oculomotorius oculonasal oculopathy oculopharyngeal dystrophy oculopharyngeal syndrome oculoplethysmography oculopneumoplethysmography oculopupillary oculorespiratory syndrome oculosympathetic oculovagal reflex oculovertebral oculovertebral dysplasia oculovertebral syndrome oculovestibuloauditory syndrome oculozygomatic oculus oculi ocy- ocytocin OD odaxesmus odaxetic ODD odd chromosome Oddi Oddi sphincter odds odds ratio Odland body odogenesis odont- odontagra odontalgia odontalgia dentalis odontalgic odontectomy odonterism odontiasis odontinoid odontitis odonto- odontoameloblastoma odontoblast odontoblastic layer odontoblastic processes odontoblastic zone odontoblastoma odontoclast odontodynia odontodysplasia odontogenesis odontogenesis imperfecta odontogenic cyst odontogenic dysplasia odontogenic fibroma odontogenic keratocyst odontogenic myxoma odontogeny odontoid odontoid process odontoid process of epistropheus odontoid vertebra odontology odontoloxia odontolysis odontoma odontoneuralgia odontonomy odontonosology odontoparallaxis odontopathy odontophobia odontoplasty odontoprisis odontoptosis odontorrhagia odontoschism odontoscope odontoscopy odontosis odontotherapy odontotomy odor odorant odorant binding protein odoratism odoriferous odoriferous gland odorimeter odorimetry odorivection odorography odorous odors ODT odyn- odynacusis odynophagia odynophonia Oe oe- oedipal neurosis oedipal period oedipal phase oedipism Oedipus complex Oehl Oehl muscles oenanthal oerstedOe oesophagostomiasis Oesophagostomum Oesophagostomum apiostomum Oesophagostomum brevicaudum Oesophagostomum brumpti Oesophagostomum columbianum Oesophagostomum dentatum Oesophagostomum georgianum Oesophagostomum quadrispinulatum Oesophagostomum radiatum Oesophagostomum stephanostomum Oesophagostomum venulosum oestradiol oestrids oestriol oestrogen oestrone oestrosis Oestrus