- Cross-validation
- Crossbite
- Crossflow filtration
- Crossing over
- Crosslinker
- Crosslinking of DNA
- Crossmodal
- Crossover experiment
- Crossover study
- Crosstalk
- Crotalidae polyvalent immune fab
- Crotamine
- Crotamiton
- Croton
- Croton lechleri
- Croton oil
- Croton tiglium
- Crotonaldehyde
- Crotonic acid
- Crotoxin
- Croup
- Crowding
- Crown
- Crown lengthening
- Crown rump length
- Crown-rump length
- Cruciate ligament
- Cruciferous vegetables
- Crude drugs
- Crude oil
- Crude protein
- Cruelty
- Crura
- Crural fascia
- Crush injury
- Crush syndrome
- Crutches
- Cruzipain
- Cry1Ac
- Cryab
- Crying
- Cryo-electron microscopy
- Cryo-transmission electron microscopy
- Cryoablation
- Cryobiology
- Cryocoolers
- Cryoelectron microscopy
- Cryoelectron tomography
- Cryofibrinogenemia
- Cryofixation
- Cryogenic grinding
- Cryogenic temperature
- Cryogenics
- Cryoglobulin
- Cryoglobulinemia
- Cryoglobulinemic vasculitis
- Cryolite
- Cryoneurolysis
- Cryoprecipitate
- Cryopreservation
- Cryopreservation of testicular tissue
- Cryoprobe
- Cryoprotectants
- Cryopyrin
- Cryopyrin-associated periodic syndrome
- Cryostat
- Cryosupernatant
- Cryosurgery
- Cryotherapy
- Cryptic relatedness
- Cryptitis
- Cryptochrome
- Cryptococcal meningitis
- Cryptococcosis
- Cryptococcus
- Cryptococcus gattii
- Cryptococcus neoformans
- Cryptogenic organizing pneumonia
- Cryptophthalmos
- Cryptorchidism
- Cryptosporidiosis
- Cryptosporidium
- Cryptosporidium hominis
- Cryptosporidium muris
- Cryptosporidium parvum
- Cryptoxanthin
- Crystal arthropathy
- Crystal monochromator
- Crystal structure
- Crystal violet
- Crystallin
- Crystallization
- Crystallography
- Crystalloids
- Crystalluria
- Csf2ra
- Ctenocephalides felis
- Cubital fossa
- Cubital tunnel
- Cubital tunnel syndrome
- Cubitus interruptus
- Cubitus valgus
- Cubitus varus
- Cucumber mosaic virus
- Cucurbita pepo
- Cucurbitacin
- Cucurbitane
- Cue reactivity
- Cuffitis
- Culdocentesis
- Culex
- Culex tarsalis
- Culex tritaeniorhynchus
- Culicidae
- Cullen's sign
- Cullin
- Culmen
- Cultivation
- Cultural bias
- Cultural competence
- Cultural competency training
- Cultural differences
- Cultural identity
- Cultural mediation
- Cultural phenomenon
- Cultural psychiatry
- Cultural psychology
- Cultural values
- Culture bound syndromes
- Culture conversion
- Culture media
- Culture of fear
- Culture-bound syndromes
- Cumene
- Cumin
- Cumulative dose
- Cumulative incidence
- Cumulative trauma disorder
- Cumulus cells
- Cumulus oophorus
- Cuneate fasciculus
- Cuneate nucleus
- Cuneiform
- Cuneiform bone
- Cuneiform cartilage
- Cuneiform cartilages
- Cuneus
- Cunnilingus
- Cunninghamella
- Cup to disc ratio