China 
Africa 
Japan 
- Conventional treatment
- Convergence insufficiency
- Convergent extension
- Convergent strabismus
- Conversion disorder
- Conversion therapy
- Convolutional layer
- Convolutional neural networks
- Convulsant
- Convulsions
- CooA
- Cooking
- Cool down
- Coolant
- Coolidge effect
- Cooling bath
- Coomassie brilliant blue
- Coombs test
- Cooper test
- Cooper's ligaments
- Cooperation
- Cooperativeness
- Cooperativity
- Coordinate covalent bond
- Coordinated Specialty Care
- Coordination compound
- Coordination polymers
- Copaene
- Copaiba
- Copalic acid
- Copanlisib
- Copepoda
- Copepods
- Copeptin
- Coping mechanisms
- Coping planning
- Coping strategies
- Coping strategy
- Copolyester
- Copolymerization
- Copolymers
- Copper
- Copper 64
- Copper acetate
- Copper carbonate
- Copper chloride
- Copper deficiency
- Copper gluconate
- Copper intrauterine device
- Copper metabolism
- Copper nanoparticles
- Copper oxide
- Copper protein
- Copper sulfate
- Copper toxicity
- Coprecipitation
- Coprolalia
- Coprophagia
- Coprophagy
- Coproporphyria
- Coproporphyrinogen III
- Coproporphyrinogen iii oxidase
- Copropraxia
- Coprostanol
- Coprosterol
- Coptis
- Coptis chinensis
- Coptisine
- Copula
- Copulation
- Copurification
- Copy number analysis
- Copy number variation
- Copy-number variation
- Cor pulmonale
- Cor triatriatum
- Coracobrachialis
- Coracobrachialis muscle
- Coracoclavicular ligament
- Coracohumeral ligament
- Coracoid
- Coracoid process
- Cord blood
- Cord factor
- Cord prolapse
- Cordectomy
- Cordial
- Cordocentesis
- Cordon sanitaire
- Cordotomy
- Cordycepin
- Core binding factor
- Core body temperature
- Core needle biopsy
- Core oligosaccharide
- Core protein
- Core stability
- Core temperature
- Corectopia
- Coregulators
- Corepressor
- Cori cycle
- Coriander
- Corifollitropin alfa
- Corilagin
- Cork borer
- Corms
- Corn
- Corn oil
- Cornea
- Cornea transplantation
- Cornea verticillata
- Corneal abrasions
- Corneal button
- Corneal collagen cross-linking
- Corneal crosslinking
- Corneal disease
- Corneal diseases
- Corneal dystrophy
- Corneal endothelium
- Corneal epithelial
- Corneal erosion
- Corneal hydrops
- Corneal inlay
- Corneal limbus
- Corneal neovascularization
- Corneal opacity
- Corneal pachymetry
- Corneal perforation
- Corneal reflex
- Corneal stroma
- Corneal topography
- Corneal transplantation
- Corneal ulcers
- Cornelia de Lange syndrome
- Corneocytes
- Corniculate cartilage
- Corniculate cartilages
- Corns
- Cornual pregnancy
- Cornus officinalis
- Corona radiata
- Coronal plane
- Coronal suture
- Coronary
- Coronary CT angiography
- Coronary angiography
- Coronary arteries
- Coronary artery
- Coronary artery aneurysm