- Cup-to-disc ratio
- Cupid's bow
- Cupin superfamily
- Cupping
- Cupping therapy
- Cupriavidus
- Cupriavidus metallidurans
- Cupriavidus necator
- Cupric chloride
- Curare
- Curative care
- Curcuma
- Curcuma longa
- Curcuma xanthorrhiza
- Curcuma zedoaria
- Curcumin
- Curcuminoids
- Curd
- Curdlan
- Cure
- Cured meats
- Curettage
- Curette
- Curing
- Curiosity
- Curli
- Currants
- Currarino syndrome
- Current clamps
- Current good tissue practices
- Current of injury
- Curve of Spee
- Cuscohygrine
- Cushing reflex
- Cushing syndrome
- Cushing's disease
- Cushing's syndrome
- Custard
- Cutaneous T-cell lymphoma
- Cutaneous diphtheria
- Cutaneous horn
- Cutaneous innervation
- Cutaneous larva migrans
- Cutaneous leishmaniasis
- Cutaneous lymphoma
- Cutaneous receptors
- Cutaneous vasculitis
- Cutibacterium acnes
- Cuticle
- Cuticular plate
- Cutis
- Cutis laxa
- Cutis marmorata
- Cutis marmorata telangiectatica congenita
- Cutting
- Cuvette
- CyTOF
- Cyan fluorescent protein
- Cyanate
- Cyanation
- Cyanic acid
- Cyanide
- Cyanide poisoning
- Cyanine
- Cyanine dyes
- Cyano groups
- Cyanoacetamide
- Cyanoacrylate
- Cyanobacteria
- Cyanocobalamin
- Cyanogen chloride
- Cyanogenic glycosides
- Cyanomethyl
- Cyanophages
- Cyanopsia
- Cyanosis
- Cyanotic heart disease
- Cyanuric chloride
- Cyanuric fluoride
- CyberKnife
- Cyberbullying
- Cyberchondria
- Cybernetics
- Cyborg
- Cycasin
- Cyclandelate
- Cyclase
- Cyclic
- Cyclic ADP-ribose
- Cyclic AMP
- Cyclic AMP phosphodiesterase
- Cyclic GMP
- Cyclic GMP-AMP synthase
- Cyclic adenosine monophosphate
- Cyclic amine
- Cyclic compound
- Cyclic di-AMP
- Cyclic di-GMP
- Cyclic guanosine monophosphate
- Cyclic neutropenia
- Cyclic nucleotide phosphodiesterase
- Cyclic nucleotide-binding domain
- Cyclic nucleotides
- Cyclic peptides
- Cyclic vomiting syndrome
- Cyclin
- Cyclin A
- Cyclin A1
- Cyclin A2
- Cyclin B
- Cyclin B2
- Cyclin D
- Cyclin D1
- Cyclin D3
- Cyclin E
- Cyclin E1
- Cyclin E2
- Cyclin dependent kinase
- Cyclin dependent kinase inhibitor
- Cyclin dependent kinase inhibitor 2a
- Cyclin-dependent kinase
- Cyclin-dependent kinase inhibitor
- Cycline
- Cycling
- Cyclins
- Cyclization
- Cyclizine
- Cycloamylose
- Cycloastragenol
- Cyclobenzaprine
- Cyclobutane
- Cyclodextrin
- Cycloguanil
- Cyclohexane
- Cyclohexylamine
- Cyclooxygenase
- Cyclooxygenase 1
- Cyclooxygenase 2
- Cyclopamine
- Cyclopentene
- Cyclopentenone
- Cyclopenthiazide
- Cyclopentolate
- Cyclopeptides
- Cyclophilin
- Cyclophilin D
- Cyclophosphamide
- Cyclopia
- Cyclopiazonic acid
- Cycloplegia