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- O'Bleness Hospital
- O'Conor
- O'nyong'nyong virus
- O-Anisic acid
- O-Cresol
- O-Dianisidine
- O-succinylbenzoate—CoA ligase
- O. H. Frazier
- OAD
- OBO Foundry
- OBS
- OCP
- OCP Group
- OGFr
- OGT
- OHA
- OLED
- OLED#Polymer light-emitting diodes
- OMAP
- OMG (gene)
- ONS coding system#Geography of the UK Census
- OO
- OP
- OPA
- OPD
- ORAI1
- ORAI2
- ORC1
- ORC2
- ORC3
- ORC4
- ORC5
- ORC6
- OST
- OT-62 TOPAS
- OVO (disambiguation)
- OX40 ligand
- Oak Hill College
- Oast house
- Oat (disambiguation)
- Oatgrass
- Obesity hypoventilation syndrome
- Obesity-associated morbidity#Diabetes mellitus
- Obesogen
- Object relations theory
- Objective structured clinical examination
- Oblation (album)
- Oblique arytenoid
- Oblique cord
- Oblique dendrite
- Oblique muscle
- Oblique muscle of abdomen
- Oblique muscle of auricle
- Oblique muscle of eye
- Oblique popliteal ligament
- Oblique projection
- Oblique ridges of scapula
- Obliquus capitis inferior muscle
- Obliquus capitis muscle
- Obliquus capitis superior muscle
- Obliterating endarteritis
- Obliterator (disambiguation)
- Obscurin
- Observational error
- Observational learning
- Observer-expectancy effect
- Obsessive–compulsive personality disorder
- Obsessive–compulsive personality disorder#Psychoanalytic
- Obsessive–compulsive spectrum
- Obstetric labor complication
- Obstetrical bleeding
- Obstetrics & Gynecology (journal)
- Obstetrics and gynaecology
- Obstructed defecation
- Obstructed labour
- Obstructive lung disease
- Obturator canal
- Obturator crest
- Obturator externus groove
- Obturator fascia
- Obturator foramen
- Obturator internus nerve
- Obturator membrane
- Obturator muscles
- Obturator nerve
- Obturator nerve#Branches
- Obturator veins
- Occipital branch
- Occipital branches of occipital artery
- Occipital bun
- Occipital condyles
- Occipital crest
- Occipital emissary vein
- Occipital gyri
- Occipital lymph nodes
- Occipital nerve
- Occipital protuberance
- Occipital sinus
- Occipitalis muscle
- Occipitofrontal fasciculus
- Occipitofrontalis muscle
- Occlusive dressing
- Occupational and Environmental Medicine
- Occupational burnout
- Occupational hazards of human nail dust
- Occupational lung disease#Silo-Filler.27s disease
- Occupational lung disease#Silo-filler's disease
- Occupational noise
- Occupy movement hand signals
- Ocean gyre
- Ochratoxin
- Ochrea
- Ochsner Medical Center – Kenner
- Ochsner Medical Center – West Bank
- Ocimum americanum
- Oct-1-en-3-one
- Oct-4
- Octahedron
- Octamer transcription factor
- Octamoxin
- Octanoyl-CoA
- Octatropine methylbromide
- Octopamine
- Octyl salicylate
- Ocular dominance
- Ocular prosthesis
- Ocular rosacea
- Ocular scales
- Ocular tonometry
- Oculogyric crisis
- Oculomotor apraxia
- Oculomotor nerve palsy
- Oculoplastics
- Odd Man Out (disambiguation)
- Oddo–Harkins rule
- Odds and evens (hand game)
- Odes (Horace)
- Odessa National Medical University
- Odontoblast process
- Odontogenic keratocyst
- Odontogenic tumor
- Odor detection threshold#Odor detection value
- Odorant-binding protein
- Odoratus
- Oenotropae
- Oesophageal pouch
- Oesophagostomum
- Off the Ground
- Off the Hook
- Off the Wall
- Off-pump coronary artery bypass
- Off-road vehicle
- Off-site data protection
- Office of Economic Opportunity
- Office of the Assistant Secretary for Health
- Officinalis
- Oganesson
- Ogi (food)
- Ohio State University College of Medicine
- Ohmic contact
- Ohngren's line
- Oidium (spore)
- Oikophobia
- Oil drying agent
- Oil immersion#Immersion oil
- Oil immersion#Oil immersion objectives
- Oil painting reproduction
- Oirats
- Okavirus
- Okazaki fragments
- Oklahoma State University Center for Health Sciences
- Olanzapine/fluoxetine
- Old Kentish Sign Language
- Old Operating Theatre Museum and Herb Garret
- Old Style and New Style dates
- Old West Academy
- Old age and driving
- Old man's beard
- Old people's home
- Oldenlandia
- Oldest profession (phrase)
- Olduvai domain
- Olecranon fossa
- Olefin metathesis
- Oleochemistry
- Olfactophilia
- Olfactory foramina
- Olfactory glands
- Olfactory receptor neuron
- Olfactory reference syndrome
- Olfactory tubercle
- Oliebol
- Olig, California
- Oligodendrocyte progenitor cell
- Oligogenic inheritance
- Oligolecty
- Olivary body
- Olive (color)#Olive drab
- Olive (color)#Olive green
- Olive View–UCLA Medical Center
- Olive baboon
- Olive ridley sea turtle
- Oliver Sipple
- Oliver's sign
- Olivier Busquet
- Olivocerebellar tract
- Olivocochlear system
- Olivospinal tract
- Olmo grapes
- Olney's lesions
- Olodaterol
- Olopatadine/mometasone
- Olt (river)
- Ome
- Omega (disambiguation)
- Omega-3 acid ethyl esters
- Omega-3 carboxylic acids
- Omega-6 fatty acid
- Omega-Grammotoxin SIA
- Omental foramen
- Omia
- Omicron Piscium
- Ommochrome
- Omphalomesenteric duct cyst
- Omphisa fuscidentalis
- On Ice
- On Thin Ice
- On Top
- On Top of the World
- On and Off
- On and On
- On the Ground
- On the House
- On the Level
- On the Line
- On the Origin of Species
- On the Run
- On the Spot
- On the Wallaby Track
- On the Wing
- On-board
- On-call room
- On-demand
- On-time performance
- On-water reaction
- Once upon a time
- Onchocerca
- Oncocytoma
- Oncofetal antigen
- Oncolytic adenovirus#Onyx-015 (dl1520)
- Oncomodulin 2
- Oncotic pressure
- Oncovirus
- One Hot Minute
- One- and two-tailed tests
- One-compartment kinetics
- One-night stand
- One-pot synthesis
- One-way analysis of variance
- Oneiros
- Oniongrass
- Onium ion
- Online Mendelian Inheritance in Man
- Online and offline
- Online counseling
- Online shopping
- Ontario Health Insurance Plan
- Ontario Shores Centre for Mental Health Sciences
- Onuf's nucleus
- Onychogryphosis
- Onychoptosis defluvium
- Onychorrhexis
- Oocyte activation
- Oogamy
- Oogonium
- Oomycete
- Oophagy
- Ootheca
- Opacity (optics)
- Opalin
- Opalinidae
- Open Babel
- Open NAND Flash Interface Working Group
- Open Source Enterprise
- Open University of Hong Kong
- Open air
- Open kinetic chain exercises
- Open-chain compound
- Open-core model
- Open-label trial
- Opera Jawa
- Operating room management
- Operation Temperer
- Operation of computed tomography#Spiral
- Operational database
- Operculina turpethum
- Operculum (brain)
- Operculum (fish)
- Ophiognomonia clavigignenti-juglandacearum
- Ophrys sphegodes
- Ophthalmic veins
- Ophthalmogram
- Ophthalmoparesis
- Opioid overdose
- Opioid peptide
- Opioid peptide#Endogenous opioids
- Opioid receptor
- Opioid use disorder
- Opioid use disorder#Management
- Opioid use disorder#Withdrawal
- Opioid-induced hyperalgesia
- Opipramol
- Opisthokont
- Opisthorchiidae
- Opisthotonus
- Opium of the people
- Opopanax (perfumery)#Balsam
- Opponens digiti minimi muscle of hand
- Opponent process
- Opt-in email
- Optic (disambiguation)
- Optic canal
- Optic cup (anatomical)
- Optic disc drusen
- Optic lobe
- Optic nerve glioma
- Optic pit
- Optical PAyload for Lasercomm Science
- Optical character recognition
- Optical computing
- Optical flow
- Optical instrument
- Optical microscope
- Optical power
- Optical properties of carbon nanotubes#Electronic structure of carbon nanotube
- Optical rotation
- Optical rotation#Forms
- Optical sectioning#Clearing agents
- Optical storage
- Optical transfer function
- Optimality Theory
- Optimism bias
- Option (filmmaking)
- Optochin
- Optography
- Optokinetic response
- Oral administration
- Oral and maxillofacial radiology
- Oral and maxillofacial surgery
- Oral irrigator
- Oral mucocele
- Oral polio vaccine AIDS hypothesis
- Oral pontine reticular nucleus
- Oral rehydration therapy
- Oralism
- Orange City Fire Department
- Orange County Fire Authority
- Orange II
- Orangey
- Oranjeboom Brewery
- Orbicularis muscle
- Orbicularis oris muscle
- Orbis International
- Orbit (anatomy)
- Orbital artery
- Orbital blowout fracture
- Orbital elements
- Orbital fascia
- Orbital fissure
- Orbital foramen
- Orbital gyri
- Orbital hybridisation
- Orbital lamina of ethmoid bone
- Orbital part
- Orbital part of frontal bone
- Orbital part of inferior frontal gyrus
- Orbital plate
- Orbital process of palatine bone
- Orbital septum
- Orbitofrontal artery
- Orbitofrontal cortex
- Orbitomeatal line
- Orcein
- Orchestrated objective reduction
- Orcinol
- Orciprenaline
- Order (biology)#Hierarchy of ranks
- Order (exchange)#Stop orders
- Order management system
- Orders of magnitude (energy)#10-21
- Orders of magnitude (length)
- Orders of magnitude (length)#1 micrometre
- Orders of magnitude (length)#1 nanometre
- Orders of magnitude (length)#Atomic to cellular scale
- Orders of magnitude (mass)
- Orders of magnitude (mass)#picogram
- Orders of magnitude (time)
- Oregon Health & Science University
- Orellani
- Orem, Utah
- Orexin
- Orexin receptor
- Orf (disease)
- Organ (biology)
- Organ (biology)#Abdomen
- Organ (biology)#Innervation
- Organ (biology)#Pelvis and perineum
- Organ (biology)#Plants
- Organ dysfunction
- Organ of Zuckerkandl
- Organ trade
- Organ transplantation in China
- Organ-on-a-chip
- Organic anion transporter 1
- Organic certification
- Organic peroxide
- Organic reaction
- Organic redox reaction
- Organization development
- Organization for Human Brain Mapping
- Organo anion transporter family
- Organoaluminium chemistry
- Organoarsenic chemistry
- Organoboron chemistry
- Organobromine compound
- Organocatalysis
- Organochloride
- Organocopper compound
- Organofluorine chemistry
- Organogold chemistry
- Organoiodine compound
- Organolithium reagent
- Organology
- Organomegaly
- Organomercury
- Organomercury#Addition to alkenes
- Organon & Co.
- Organophosphate poisoning
- Organophosphate poisoning#Neurotoxic effects
- Organophosphate-induced delayed neuropathy
- Organophosphorus compound
- Organoselenium chemistry
- Organoselenium chemistry#Selenoxide oxidations
- Organosilicon
- Organosilicon#Silyl halides
- Organosulfur compounds
- Organosulfur compounds#Basis for odor of organosulfur compounds
- Organotechnetium compound
- Organotellurium chemistry
- Organothiophosphate
- Organotin chemistry
- Organozinc compound
- Organum (instrument)
- Orgone
- Orgyia
- Orientalizing period
- Orientations of Proteins in Membranes database
- Orienting response
- Orifice of the uterus
- Origanum dictamnus#Description
- Origin recognition complex
- Ormeloxifene
- Ornge
- Ornithine aminotransferase
- Ornithine translocase
- Ornithodoros
- Ornithonyssus bursa
- Ornithonyssus sylviarum
- Ornstein–Uhlenbeck process
- Orobanche
- Orofacial granulomatosis
- Oropouche orthobunyavirus
- Orotic acid
- Orotic aciduria
- Orotidine 5'-monophosphate
- Orotidine 5'-phosphate decarboxylase
- Orphan Drug Act of 1983
- Orsa
- Orsan plan
- Ortho acid
- Orthochromasia
- Orthodontic archwire
- Orthodontic technology
- Orthogenesis
- Orthognathic surgery
- Orthograde posture
- Orthohantavirus
- Orthomolecular psychiatry
- Orthomolecular psychiatry#Histadelia
- Orthopaedic Nursing (journal)
- Orthopedic cast
- Orthopedic cast#Spica cast
- Orthopraxy
- Orthorhombic crystal system
- Orthornavirae
- Orthostatic albuminuria
- Orthotics
- Orthotics#Ankle–foot orthosis (AFO)
- Orthotist
- Orthotospovirus
- Orthovoltage X-rays
- Orungo virus
- Oryzomyini
- Os triangulare
- Osazone
- Osculum
- Osgood–Schlatter disease
- Osiris (disambiguation)
- Oskar Minkowski
- Osler's node
- Oslo University Hospital, Aker
- Oslo University Hospital, Ullevål
- Osmeterium
- Osmia cornifrons
- Osmia lignaria
- Osmolal gap
- Osmometer
- Osmophile
- Osmoregulation
- Osmose Productions
- Osmotic concentration
- Osmotic concentration#Unit
- Osmunda japonica
- Osmundea pinnatifida
- Ossification center
- Osteitis fibrosa cystica
- Osteo-odonto-keratoprosthesis
- Osteoglycin
- Ostomy system
- Ostrea lurida
- Oswaldo Cruz Foundation
- Otera's catalyst
- Otfrid of Weissenburg
- Other specified feeding or eating disorder
- Otic placode
- Oto-palato-digital syndrome
- Otobius megnini
- Otoferlin
- Otospondylomegaepiphyseal dysplasia
- Ottawa Hospital Research Institute
- Ottawa ankle rules
- Ouabain
- Ouchterlony double immunodiffusion
- Our Lady of Sorrows
- Out of Sync
- Out of True
- Outdoor emergency care
- Outer nuclear layer
- Outer plexiform layer
- Outline of actuarial science
- Outline of biochemistry#Biochemical techniques
- Outline of biology
- Outline of chemistry
- Outline of life forms
- Outline of space science
- Outline of the human brain
- Outpatient surgery
- Outpatient surgery#Ambulatory surgery center
- Outpatient surgery#Ambulatory surgery centers
- Outsourcing#Terminology
- Ovandrotone albumin
- Ovarian branch of uterine artery
- Ovarian fossa
- Ovarian hyperstimulation syndrome
- Ovarian ligament
- Ovarian mucinous tumor
- Ovarian plexus
- Ovarian tumor
- Ovary (botany)
- Ovary (botany)#Inferior ovary
- Ovation Pharmaceuticals
- Over the top
- Over-the-counter (finance)
- Overdetermined
- Overdose (disambiguation)
- Overhead power line
- Overillumination
- Overlapping gene
- Overline
- Overmedication
- Overmedication#Overprescription
- Overshooting model
- Overwhelming post-splenectomy infection
- Ovine pulmonary adenocarcinoma
- Ovine rinderpest
- Oviparity
- Owl butterfly
- Oxabolone cipionate
- Oxadiazole
- Oxalate—CoA ligase
- Oxalosuccinic acid
- Oxalyl
- Oxapium iodide
- Oxatomide
- Oxazepine
- Oxazines
- Oxazole
- Oxazolidinedione
- Oxendolone
- Oxera
- Oxetacaine
- Oxford spelling
- Oxford–AstraZeneca COVID-19 vaccine
- Oxitropium bromide
- Oxocarbon
- Oxoglutarate dehydrogenase complex
- Oxohalide
- Oxomemazine
- Oxon (chemical)
- Oxyanion hole
- Oxybuprocaine
- Oxycodone/ibuprofen
- Oxycodone/naloxone
- Oxycodone/paracetamol
- Oxygen enhancement ratio
- Oxygen fluoride
- Oxygen permeability
- Oxygen radical absorbance capacity
- Oxygen saturation
- Oxygen scavenger
- Oxygen toxicity
- Oxygen-18
- Oxygen–hemoglobin dissociation curve
- Oxymercuration reaction
- Oxymesterone
- Oxymonad
- Oxyphenisatine
- Oxyphil cell
- Oxytocin/ergometrine
- Ozalid (trade mark)
- Ozone Action Day
- Oʻahu tree snail
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