| Chromosomes, Human, Pair 8 |
| Chromosomes, Human, Pair 9 |
| Chromosomes, Human, X |
| Chromosomes, Human, Y |
| Chromosomes, Mammalian |
| Chromosomes, Plant |
| Chronaxy |
| Chronic Disease |
| Chronobiology |
| Chronobiology Disorders |
| Chronology [Publication Type] |
| Chronotherapy |
| Chrysanthemum |
| Chrysanthemum cinerariifolium |
| Chrysenes |
| Chryseobacterium |
| Chrysobalanaceae |
| Chrysosporium |
| Church of Jesus Christ of Latter-day Saints |
| Churg-Strauss Syndrome |
| Chyle |
| Chylomicrons |
| Chylothorax |
| Chylous Ascites |
| Chymopapain |
| Chymosin |
| Chymotrypsin |
| Chytridiomycota |
| Cialit |
| Cicatrix |
| Cicatrix, Hypertrophic |
| Cicer |
| Cichlids |
| Cicuta |
| Ciguatera Poisoning |
| Ciguatoxins |
| Cilastatin |
| Cilazapril |
| Cilia |
| Ciliary Arteries |
| Ciliary Body |
| Ciliary Motility Disorders |
| Ciliary Neurotrophic Factor |
| Ciliophora |
| Ciliophora Infections |
| Cimetidine |
| Cimicidae |
| Cimicifuga |
| Cinanserin |
| Cinchona |
| Cinchona Alkaloids |
| Cineangiography |
| Cineradiography |
| Cinnamomum |
| Cinnamomum aromaticum |
| Cinnamomum camphora |
| Cinnamomum zeylanicum |
| Cinnarizine |
| Cinoxacin |
| Ciona intestinalis |
| Ciprofloxacin |
| Circadian Rhythm |
| Circle of Willis |
| Circoviridae |
| Circoviridae Infections |
| Circovirus |
| Circular Dichroism |
| Circulatory and Respiratory Physiology |
| Circulatory Arrest, Deep Hypothermia Induced |
| Circumcision |
| Circumcision, Female |
| Cirsium |
| cis-trans-Isomerases |
| Cisapride |
| Cisplatin |
| Cissampelos |
| Cissus |
| Cistaceae |
| Cistanche |
| Cistus |
| Citalopram |
| Cities |
| Citraconic Anhydrides |
| Citrate (si)-Synthase |
| Citric Acid |
| Citric Acid Cycle |
| Citrinin |
| Citrobacter |
| Citrobacter freundii |
| Citrobacter koseri |