Biology Dictionary: O
Search or browse the dictionary for the definition of biology terms starting with the letter “O”.
Dictionary > O
O
- O agglutinin
- O antigen
- O antigens
- O-acetylcarnitine
- O-acetylhomoserine thiol-lyase
- O-aminoazotoluene
- O-aminobenzoic acid
- O-antigen depolymerase
- O-antigen polymerase
- O-benzenedialdehyde
- O-diethylaminoethyl cellulose
- O-point
- O-sialoglycoprotein endopeptidase
- O-triethylaminoethyl cellulose
- Oafish
- Oak
- Oak apple
- Oaken
- Oaks
- Oar
- Oared
- Oari-
- Oars
- Oasthouse urine disease
- Oat cell
- Oat cell cancer
- Oat cell carcinoma
- Oatmeal
- Oatmeal-tomato paste agar
- Oats
- Oav syndrome
- Ob
- Ob/gyn
- Obcordate
- Obdiplostemonous
- Obdiplostemony
- Obdormition
- Obduracy
- Obdurate
- Obeirnes sphincter
- Obeirnes valve
- Obeisance
- Obeliac
- Obelin
- Obelion
- Obelisk
- Obermayers test
- Oberon
- Obersteiner-redlich line
- Obesity
- Obesity index
- Obesity morbid
- Obex
- Obfuscate
- Obidoxime chloride
- Obimbricate
- Object
- Object attachment
- Object blindness
- Object choice
- Object field
- Object glass
- Object space
- Objective
- Objective assessment data
- Objective circle
- Objective fluorite
- Objective sign
- Objective symptom
- Objective synonym
- Objectives
- Objects
- Oblate
- Oblati
- Oblatum
- Obligate
- Obligate aerobe
- Obligate anaerobe
- Obligate anarobes
- Obligate mutualism
- Obligate parasite
- Oblige
- Oblique
- Oblique arytenoid
- Oblique auricular muscle
- Oblique line of mandible
- Oblique line of thyroid cartilage
- Oblique muscle
- Obliquity
- Obliquus capitis superior
- Obliterate
- Oblong pit of arytenoid cartilage
- Oblongum
- Obomegoid
- Obovate
- Obs
- Obscure
- Observant
- Observation
- Observer
- Obsession
- Obsessive personality
- Obsessive-compulsive personality
- Obsidian
- Obsolete
- Obsoleteness
- Obstacle
- Obstacle sense
- Obstetric
- Obstetric surgical procedures
- Obstetric ultrasound
- Obstetrical
- Obstetrical forceps
- Obstetrical hand
- Obstetrics
- Obstinate
- Obstruction
- Obstructive apnea
- Obstructive appendicitis
- Obstructive dysmenorrhoea
- Obstructive jaundice
- Obtected
- Obturator membrane
- Obturator nerve
- Obturator tubercle
- Obturator vein
- Obumbrant
- Oca
- Occams razor
- Occipital
- Occipital anchorage
- Occipital angle of parietal bone
- Occipital artery
- Occipital bone
- Occipital fontanel
- Occipital gyrus
- Occipital pole
- Occiput
- Occluded Front
- Occlusal bite line
- Occlusal rests
- Occlusal surface
- Occlusal surfaces
- Occlusal vertical dimension
- Occlusion
- Occlusion rims
- Occlusometer
- Occulomotor nerve
- Occult
- Occult bleeding
- Occult blood
- Occult border of nail
- Occult carcinoma
- Occult hydrocephalus
- Occultation
- Occupational deafness
- Occupational dentistry
- Occupational disease
- Occupational exposure
- Occupational health
- Occupational health nursing
- Occupational neurosis
- Occupational spasm
- Occupational therapist
- Occupational therapy
- Occupational therapy department hospital
- Occupations
- Ocean
- Ocean-type fish
- Oceanian realm
- Oceanodromous
- Oceanography
- Oceanospirillum
- Oceans
- Oceanus
- Ocellated
- Ocellus
- Oceloid
- Ocelot
- Ochlesis
- Ochlophobia
- Ochre
- Ochre codon
- Ochre suppressor
- Ocra
- Octahedrons
- Octapeptide
- Octology
- Octopine
- Octoploid
- Octopus
- Octose
- Octyl gallate
- Octyl glucoside
- Octylic
- Octylphenoxy polyethoxyethanol
- Ocular
- Ocular albinism
- Ocular bobbing
- Ocular cone
- Ocular crisis
- Ocular cup
- Ocular micrometer
- Ocular tension
- Ocular toxoplasmosis
- Oculocutaneous albinism
- Oculomandibulodyscephaly
- Oculomandibulofacial syndrome
- Oculomotor
- Oculomotor apraxia
- Oculomotor nerve
- Oculus
- Ocypodian
- Ocyte
- Odd chromosome
- Odd-pinnate
- Odd-skipped
- Odd-year run
- Oddi
- Oddi ruggero
- Oddis sphincter
- Odds
- Odds ratio
- Odontocete
- Odontoid ligament
- Odontoid process
- Odontoid process of epistropheus
- Odontoparallaxis
- Odontopathy
- Odontophobia
- Odontophora
- Odontophore
- Odontophorous
- Odontoplast
- Odontoplasty
- Odontoprisis
- Odontopteryx
- Odontornithes
- Odontosis
- Odontostomatous
- Odontotormae
- Odorline
- Odour
- Odourant
- Odourant binding protein
- Odouratism
- Odouriferous gland
- Odourimetry
- Odourivection
- Odourous
- Odynacusis
- Odynometer
- Odynophagia
- Odynophonia
- Oe
- Oecoid
- Oecology
- Oedema
- Oedema disease of swine
- Oedema glottidis
- Oedipus complex
- Oersted
- Oesophageal
- Oesophageal candidiasis
- Oesophageal carcinoma
- Oesophageal carcinoma types
- Oesophageal diverticula
- Oesophageal diverticulum
- Oesophageal hiatus
- Oesophageal ulcers
- Oesophageal varices
- Oesophagram
- Oesophagus
- Oestrogens catechol
- Oestrogens conjugated
- Oestrogens synthetic
- Oestrosis
- Oestrous Cycle
- Oestrous cycle
- Oestruation
- Oestrus
- Ofd syndrome
- Off
- Off-label
- Off-label use
- Off-road motor vehicles
- Offal
- Offend
- Offensive
- Office
- Official
- Official formula
- Offset
- Offsets
- Offshoot
- Offspring
- Ofloxacin
- Ofujis disease
- Ogeechee lime
- Ohi
- Ohi-s
- Ohm
- Ohm georg
- Ohms law
- Ohngrens line
- Oidia
- Oidiomycin
- Oidium
- Oil
- Oil bath
- Oil cyst
- Oil embolism
- Oil of american wormseed
- Oil of anise
- Oil of bay
- Oil of bergamot
- Oil of bitter almond
- Oil of bitter almonds
- Oil of bitter orange
- Oil of lemon
- Oil of lemon grass
- Oil of pennyroyal
- Oil of peppermint
- Oil of spearmint
- Oil of turpentine
- Oil of vitriol
- Oil of wormwood
- Oil pneumonia
- Oil red o
- Oil retention enema
- Oil sugar
- Oil tumour
- Oil vaccine
- Oilbird
- Oilnut
- Oils
- Oils volatile
- Oilseed
- Oily granuloma
- Oinomania
- Ointment
- Ointment base
- Ointment bases
- Ojibway
- Okadaic acid
- Okadaic acid-sensitive phosphatase
- Okazaki
- Okazaki fragment
- Okazaki fragments
- Okenite
- Okra
- Okt-cells
- Olamine
- Old world leishmaniasis
- Old World monkey
- Old yellow enzyme
- Old-growth stand
- Old-womanish
- Olea
- Oleaceous
- Oleander
- Oleandomycin
- Oleandomycin phosphate
- Oleandrine
- Oleanolic acid
- Oleaster
- Oleate
- Olecranon
- Olecranon bursitis
- Olecranon fossa
- Olecranon process
- Olefiant
- Oleic
- Oleic acid
- Oleo-
- Oleomargarine
- Oleoresin
- Olfactie
- Olfaction
- Olfactometry
- Olfactophobia
- Olfactory
- Olfactory angle
- Olfactory area
- Olfactory bulb
- Olfactory bundle
- Olfactory cortex
- Olfactory epithelium
- Olfactory hypesthesia
- Olfactory membrane
- Olfactory mucosa
- Olfactory nerve
- Olfactory neuroblastoma
- Olfactory neurons
- Olfactory organ
- Olfactory organs
- Olfactory receptor cells
- Olfactory receptor neurons
- Olfactory tract
- Olfactory trigone
- Olfactory tubercle
- Olfacty
- Oliban
- Olibanum
- Olibene
- Olig-
- Oligaemia
- Oligaemic
- Oligaemic shock
- Oligist
- Oligoclase
- Oligodendrocyte transcription factor 1
- Oligodendrocytes
- Oligodendroglia
- Oligohydramnios
- Oligomenorrhoea
- Oligonucleotide
- Oligonucleotides
- Oligopeptidase
- Oligopeptide
- Oligopnea
- Oligoptyalism
- Oligoria
- Oligoribonuclease
- Oligoribonucleotides
- Oligosaccharide
- Oligosaccharide 2-o-sulfatase
- Oligosaccharide dehydrogenase
- Oligosaccharides
- Oligospermia
- Oligozoospermia
- Oliguria
- Oliva
- Oliva inferior
- Oliva superior
- Olivary body
- Olivary eminence
- Olive
- Olive oil
- Olive-tipped catheter
- Olived
- Olivenite
- Olives
- Olivewood
- Olivine
- Olivopontocerebellar atrophy
- Ollier-thiersch graft
- Olliers theory
- Ology
- Ololiuqui
- Olophonia
- Olszewski disease
- Olympian forehead
- Omagra
- Omahas
- Omander wood
- Omasitis
- Omasum
- Omega
- Omega-6 fatty acid
- Omega-oxidation theory
- Omega−3 fatty acid
- Omenn
- Omenns syndrome
- Omental
- Omental branches
- Omental bursa
- Omental enterocleisis
- Omental sac
- Omentofixation
- Omentopexy
- Omentorrhaphy
- Omentovolvulus
- Omentulum
- Omentum
- Omentum majus
- Omentum minus
- Omentumectomy
- Omeprazole
- Ominous
- Omission
- Omit
- Ommateal
- Ommateum
- Ommatidium
- Ommaya reservoir
- Omniscient
- Omnivore
- Omnivorous diet
- Omnivory
- Omohyoid
- Omohyoid muscle
- Omosternum
- Omsk haemorrhagic fever virus
- Onagga
- Onagrarieous
- Onappo
- Onchocerca
- Onchocerca cervicalis
- Onchocerca gibsoni
- Oncocytes
- Oncogene
- Oncogenes
- Oncogenic
- Oncostatin M
- Oncotic
- One-step procedure
- Oniomania
- Onion
- Onion bodies
- Onion bulb neuropathy
- Onions
- Oniric
- Onlay graft
- Online systems
- Only child
- Ontogenesis
- Ontogenic homeostasis
- Ontogeny
- Ontologist
- Ontology
- Onufs nucleus
- Onward
- Onych-
- Onychalgia
- Onychatrophia
- Onychauxis
- Onychectomy
- Onychocryptosis
- Onyx
- Onyxis
- Oocyst
- Oocyte
- Oogenesis
- Oogonia
- Oogonium
- Ookinete
- Oolemma
- Oology
- Oophoric
- Oorial
- Oospore
- Ootid
- Ooze
- Opacity
- Opah
- Opal suppressor
- Opalescent
- Opaque
- Opaque microscope
- Ope
- Opeidoscope
- Open biopsy
- Open bite
- Open circulatory system
- Open fracture
- Open head injury
- Open heart surgery
- Open lung biopsy
- Open pneumothorax
- Open pollination
- Open Population
- Open reading frame
- Open reading frames
- Open reduction of fractures
- Open skull fracture
- Open system
- Open tuberculosis
- Open wound
- Open-hearted
- Open-label trial
- Openbill
- Opening
- Opening axis
- Opening of superior vena cava
- Opening of the sphenoidal sinus
- Opening of uterus
- Opening to cerebral aqueduct
- Openings
- Opens
- Opera
- Opera citato
- Opera-glass hand
- Operand
- Operant behaviour
- Operant conditioning
- Operas
- Operates
- Operating microscope
- Operating room nursing
- Operating room technicians
- Operating table
- Operation
- Operations
- Operative
- Operative dentistry
- Operative myxoedema
- Operator
- Operator gene
- Operator region
- Opercle
- Opercular
- Opercular fold
- Opercular part
- Operculated
- Operculiferous
- Operculigenous
- Operculitis
- Operculum
- Operculum ilei
- Operon
- Operon Model
- Ophelic
- Ophiasis
- Ophidia
- Ophidian
- Ophiuroidea
- Ophryon
- Ophthalmia nivalis
- Ophthalmic
- Ophthalmic artery
- Ophthalmodynamometer
- Ophthalmologic surgical procedures
- Ophthalmology
- Ophthalmomalacia
- Ophthalmoplegia
- Ophthalmoscope
- Opiates
- Opine
- Opioid receptors
- Opioids
- Opiomelanocortin
- Opisthaptor
- Opisthion
- Opisthomastigote
- Opisthotic
- Opisthotonic
- Opisthotonoid
- Opisthotonos
- Opium
- Ople tree
- Opo-
- Opodidymus
- Opopanax
- Opossum
- Opponent colour
- Opportunist
- Opportunistic
- Opportunistic infections
- Opportunistic pathogen
- Oppose
- Opposer muscle of little finger
- Opposer muscle of thumb
- Opposite
- Oppositifolious
- Opposition
- Oppositipetalous
- Oppositisepalous
- Oppress
- Opsin
- Opsinogen
- Opsiuria
- Opsoclonus
- Opsogen
- Opsonin
- Opsonization
- Opsonocytophagic
- Opsonometry
- Opsonophilia
- Opsonophilic
- Optic
- Optic agnosia
- Optic ataxia
- Optic atrophy
- Optic atrophy hereditary
- Optic axis
- Optic canal
- Optic capsule
- Optic chiasm
- Optic cup
- Optic decussation
- Optic Disc
- Optic disc
- Optic disk
- Optic foramen
- Optic glioma
- Optic nerve
- Optic nerve head
- Optic nerves
- Optic papilla
- Optic sign
- Optical
- Optical aberration
- Optical axis
- Optical density
- Optical flat
- Optical illusions
- Optical rotatory dispersion
- Optical transfection
- Optically active
- Optics
- Optimal
- Optimum
- Opuntia
- Opuntia ficus-indica
- Opuntia microdasys
- Opv
- Oquassa
- Ora
- Ora serrata
- Orabase
- Orabassu
- Orache
- Orad
- Oral
- Oral biology
- Oral cancer
- Oral candidiasis
- Oral candidosis
- Oral cavity
- Oral epithelial nevus
- Oral health
- Oral moniliasis
- Oral mucosa
- Oral plate
- Oral region
- Oral surgical procedures preprosthetic
- Oral teeth
- Oral ulcer
- Oral vestibule
- Oram
- Orang
- Orang-outang
- Orange
- Orange g
- Orange wood
- Orangeroot
- Orangery
- Oranges
- Orangite
- Oratorian
- Oratory
- Orbeli effect
- Orbicular
- Orbicular muscle of mouth
- Orbicular process
- Orbicular zone
- Orbicularis oris
- Orbiculated
- Orbiculus ciliaris
- Orbit
- Orbita
- Orbital
- Orbital abscess
- Orbital artery
- Orbital axis
- Orbital ecchymoses
- Orbital eminence of zygomatic bone
- Orbital exenteration
- Orbital fasciae
- Orbital fractures
- Orbital gyri
- Orbital hernia
- Orbital implant
- Orbitofrontal cortex
- Orbitomeatal line
- Orbitosphenoid
- Orbitosphenoidal
- Orbits
- Orbivirus
- Orbulina
- Orc
- Orcein
- Orchanet
- Orchard
- Orchards
- Orchella
- Orcheo-
- Orchesography
- Orchestian
- Orchestra
- Orchi-
- Orchialgia
- Orchichorea
- Orchid
- Orchidaceous
- Orchidean
- Orchideous
- Orchids
- Orchil
- Orchis
- Orchitis parotidea
- Orchitis variolosa
- Orcin
- Orcinol
- Orcinol test
- Orciprenaline
- Orciprenaline sulfate
- Ord
- Ordeal
- Ordeal bean
- Order
- Order Of Magnitude
- Ordered on-random off mechanism
- Ordinal
- Ordinal scale
- Ordinaries
- Ordinate
- Ordination
- Ordovician
- Ordure
- Ore
- Oread
- Oreades
- Orectic
- Oregon grape
- Oreodon
- Oreodont
- Oreography
- Oreoselin
- Oreosoma
- Ores
- Orewood
- Orexia
- Orexigenic
- Orexin
- Orf virus
- Orfe
- Orfray
- Orgal
- Organ
- Organ culture
- Organ of corti
- Organ of ruffini
- Organ of Zuckerkandl
- Organ procurement
- Organ specificity
- Organ transplantation
- Organ-specific
- Organ-specific antigen
- Organa
- Organa genitalia
- Organa genitalia feminina externa
- Organa oculi accessoria
- Organa sensuum
- Organa urinaria
- Organelle
- Organic
- Organic acid
- Organic brain syndrome
- Organic catalyst
- Organic chemistry
- Organic compound
- Organic matter
- Organic mental syndrome
- Organic molecule
- Organic synthesis
- Organisation mondiale de la sant
- Organism
- Organismal density
- Organista
- Organization
- Organizational affiliation
- Organizational culture
- Organized ferment
- Organocatalyst
- Organogenesis
- Organophosphate
- Organs of zuckerkandl
- Organule
- Organum
- Organum auditus
- Orgasm
- Oriental
- Oriental cholangio-hepatitis
- Oriental ringworm
- Oriental ulcer
- Orientation
- Orientation chamber
- Orienting reflex
- Orientomycin
- Orifice
- Orifice of external acoustic meatus
- Orifice of inferior vena cava
- Orifices
- Orificium internum uteri
- Orificium ureteris
- Orificium vaginae
- Origanum
- Origanum oil
- Origin
- Origin of replication
- Originals
- Oriole
- Orion
- Ork
- Ormer
- Ormolu
- Ornate
- Ornithine
- Ornithine Cycle
- Ornithodoros
- Ornithologists
- Ornithology
- Ornithorhynchus
- Ornithotomical
- Ornithotomist
- Ornithotomy
- Oro
- Oroantral fistula
- Orodigitofacial
- Orofacial
- Orofacial fistula
- Orofaciodigital syndrome
- Oropharynx
- Orotic acid
- Orotidine
- Orotidylic acid pyrophosphorylase
- Orotracheal intubation
- Orotracheal tube
- Oroya fever
- Orphan
- Orphan disease
- Orphan drug
- Orphan drug act
- Orphan products
- Orphanages
- Orphenadrine
- Orphenadrine citrate
- Orphenadrine hydrochloride
- Orpheus
- Orpiment
- Orpin
- Orpine
- Orris
- Orseillin bb
- Orsellic
- Orsellinic
- Orthoclase
- Orthodontic bands
- Orthodontic space closure
- Orthodontic treatment
- Orthodox
- Orthogamy
- Orthogenesis
- Orthogenic
- Orthogenics
- Orthognathous
- Orthogonal
- Orthographic
- Orthologous Gene
- Orthology
- Orthopaedic
- Orthopaedic surgery
- Orthophosphate
- Orthophosphoric Acid
- Orthopnoea
- Orthoptera
- Orthopterous
- Oryx
- Oryza
- Os
- Os basilare
- Os breve
- Os coxa
- Os frontale
- Os hamatum
- Os hyoideum
- Os iliacum
- Os ilium
- Os incae
- Os incisivum
- Os innominatum
- Os malare
- Os multangulum majus
- Os multangulum minus
- Os palatinum
- Os sphenoidale
- Os subtibiale
- Os suprasternale
- Os sylvii
- Os temporale
- Os trapezoideum
- Os tribasilare
- Os trigonum
- Os triquetrum
- Os uteri externum
- Os uteri internum
- Os vesalianum
- Os zygomaticum
- Oschelephantiasis
- Oscheoplasty
- Oscillaria
- Oscillate
- Oscillates
- Oscillating
- Oscillating vision
- Oscillation
- Oscillator
- Oscillatoria
- Oscillatory
- Oscilloscope
- Oscines
- Oscinine
- Oscitate
- Osculum
- Osiers
- Osmium
- Osmium tetroxide
- Osmolality
- Osmolar
- Osmometer
- Osmoreceptor
- Osmoregulation
- Osmosis
- Osmotic diuretics
- Osmotic fragility
- Osmotic lysis
- Osmotic nephrosis
- Osmotic Potential
- Osmotic pressure
- Osmotic shock
- Osmotolerance
- Osmotrophy
- Ossa cranii
- Ossa digitorum
- Ossa membri inferioris
- Ossa membri superioris
- Osseous tissue
- Ossicle
- Ossicles
- Ossicular chain
- Ossiculum
- Ossification
- Ossifies
- Ossifrage
- Ossifragous
- Ossify
- Ossifying
- Ossifying cartilage
- Ossis
- Ossis hyoidei
- Ossis metacarpi pollicis
- Ossis sphenoidalis
- Ossis temporalis
- Ossuary
- Osteichthyes
- Osteitis deformans
- Ostembryon
- Ostemia
- Ostempyesis
- Ostensorium
- Ostentate
- Ostentatious
- Ostentive
- Ostentous
- Osteo-
- Osteoanagenesis
- Osteoarthritis
- Osteoblast
- Osteoclast
- Osteocyte
- Osteogenesis imperfecta
- Osteology
- Osteolysis essential
- Osteolytic
- Osteoma medullare
- Osteoma osteoid
- Osteomalacia
- Osteomalacic
- Osteomanty
- Osteomatoid
- Osteomere
- Osteomyelitis
- Osteomyelofibrotic syndrome
- Osteon
- Osteoncus
- Osteonecrosis
- Osteopenia
- Osteopetrosis
- Osteoplastic craniotomy
- Osteopontin
- Osteoporosis
- Osteosarcoma
- Osteosclerosis
- Ostia venarum pulmonalium
- Ostium
- Ostium vaginae
- Ostrea
- Ostreaceous
- Ostreotoxism
- Ostrich
- Ostrum-furst syndrome
- Oswego tea
- Ota masao
- Otaheite apple
- Otaheite gooseberry
- Otalgia
- Otalgic
- Otary
- Otas nevus
- Otc
- Otf
- Othello syndrome
- Otheoscope
- Other-directed
- Otic
- Otic abscess
- Otic barotrauma
- Otic capsule
- Otic ganglion
- Otic pits
- Otic placodes
- Otic vesicle
- Otis
- Otitis media
- Otoacariasis
- Otocrane
- Otocranial
- Otocranium
- Otocyst
- Otocysts
- Otodectes
- Otodectic
- Otodynia
- Otoencephalitis
- Otoganglion
- Otogenic
- Otogenous abscess
- Otolith
- Otosalpinx
- Otosclerosis
- Otoscopeic
- Otoscopy
- Otosteal
- Ototoxic
- Ototoxicity
- Otozoum
- Ottawas
- Otter
- Otters
- Otto
- Otto of rose
- Otto pelvis
- Ottoson
- Ottoson potential
- Ottrelite
- Ouabagenin
- Ouabain
- Ouakari
- Ouanderoo
- Ouchterlony method
- Ouchterlony technique
- Ouchterlony test
- Ouistiti
- Oul-
- Oulachan
- Ourang
- Ourang-outang
- Ouranography
- Ourebi
- Ousel
- Out of Africa model
- Out of phase
- Outbreak
- Outbreeding
- Outcrop
- Outer cone fibre
- Outer ear
- Outer membrane
- Outer table of skull
- Outgroup
- Outlet
- Outlet forceps delivery
- Outlier
- Outliers drg
- Outline form
- Outlook
- Outness
- Outpatient anaesthesia
- Output
- Outron
- Outside
- Outside out patch
- Outwelling
- Ouvarovite
- Ouzel
- Ova
- Oval
- Oval amputation
- Oval area of flechsig
- Oval corpuscle
- Oval window
- Ovalbumen
- Ovalbumin
- Ovarian
- Ovarian cycle
- Ovarian cysts
- Ovarian dysmenorrhoea
- Ovarian failure premature
- Ovarian fibroma
- Ovarian follicle
- Ovarian fossa
- Ovarian function tests
- Ovaries
- Ovarium disjunctum
- Ovarium gyratum
- Ovarium lobatum
- Ovarium masculinum
- Ovary
- Ovary dermoid cyst of the
- Ovate
- Oven dry ton
- Ovenbird
- Overbank flooding
- Overbear
- Overcome
- Overcompensation
- Overcorrection
- Overdenture
- Overdominance
- Overfishing
- Overgrowth
- Overgrowth syndromes
- Overhang
- Overhanging restoration
- Overhead cover
- Overhead projector
- Overhydration
- Overlap
- Overlap hybridization
- Overlap index
- Overlapping
- Overlapping gene
- Overlapping genes
- Overlaps
- Overlay
- Overriding
- Overshoots
- Oversight
- Overstory
- Overt homosexuality
- Overturning moment
- Overvalued idea
- Overventilation
- Overweight
- Oviduct
- Oviducts
- Ovigerus
- Oviparity
- Oviparous
- Ovipositor
- Ovocyte
- Ovoflavin
- Ovoid
- Ovoviviparous
- Ovulates
- Ovulation
- Ovule
- Ovules
- Ovulist
- Ovulite
- Ovulocyclic
- Ovulocyclic porphyria
- Ovulode
- Ovulum
- Ovum
- Ovum implantation
- Ovum implantation delayed
- Ovum transport
- Ovums
- Owe
- Owens lines
- Owl
- Owl eye cell
- Owlet
- Owls
- Owns
- Owre
- Ox
- Ox bots
- Ox heart
- Oxa-
- Oxacid
- Oxacillin
- Oxacillin sodium
- Oxalaemia
- Oxalaldehyde
- Oxalan
- Oxalate
- Oxalic
- Oxalic acid
- Oxalis
- Oxaloacetate
- Oxazepam
- Oxbiter
- Oxbow
- Oxeladin
- Oxeye
- Oxfly
- Oxheal
- Oxhide
- Oxic
- Oxiconazole
- Oxid
- Oxidant
- Oxidants
- Oxidants photochemical
- Oxidase
- Oxidase reaction
- Oxidase test
- Oxidasis
- Oxidate
- Oxidation
- Oxidation number
- Oxidation pond
- Oxidation-fermentation test
- Oxidation-reduction
- Oxidative
- Oxidative metabolism
- Oxidative phosphorylation
- Oxidative stress
- Oxide
- Oxides
- Oxidise
- Oxidised cellulose
- Oxidised glutathione
- Oxidises
- Oxidization
- Oxidize
- Oxidizer
- Oxidizing agent
- Oxidizing agents
- Oxidoreductase
- Oxidoreductases
- Oxime
- Oxy-
- Oxyacid
- Oxycephaly
- Oxychloride
- Oxychromatic
- Oxyclozanide
- Oxycodone
- Oxycrate
- Oxycymene
- Oxyesthesia
- Oxyfedrine
- Oxygen
- Oxygen affinity anoxia
- Oxygen capacity
- Oxygen compounds
- Oxygen consumption
- Oxygen Cycle
- Oxygen Debt
- Oxygen deficit
- Oxygen dependent killing
- Oxygen toxicity
- Oxygen-15
- Oxygen-16
- Oxygen-18
- Oxygenase
- Oxygenate
- Oxygenators
- Oxygenators membrane
- Oxygenic
- Oxyhemoglobin
- Oxysome
- Oxysterol-Binding Protein
- Oxytocic
- Oxytocics
- Oxytocin
- Oxyurid
- Oxyurida
- Oxyurida infections
- Oxyuridae
- Oxyuroidea
- Oyster
- Oystergreen
- Oysterling
- Oysters
- Ozena
- Ozenous
- Ozocerite
- Ozochrotia
- Ozokerite
- Ozona
- Ozonation
