- conus arteriosus
- conventional behavior
- convergence
- convergent community
- convergent evolution
- copepodid larva , copepodite
- coprodeum
- coprophage
- coprozoon
- copulatory bursa
- copulatory opening
- copulatory organ
- copulatory tube
- coracidium
- coracoid
- coracoid process
- corallite
- corallum
- corbula
- cordon
- cordylus
- core
- cornea
- corneal cell
- corneal limbus
- corniculate cartilage
- corona
- corona radiata (拉)
- corona radiata(拉)
- corona(海胆), shell
- coronal
- coronary artery
- corpora quadrigemina
- corpus albicans
- corpus callosum
- corpus cavernosum (拉)
- corpus cavernosum penis
- corpus cavernosum urethrae
- corpus luteum (拉)
- corpus striatum
- correlated character
- cortex
- cortical reaction
- cortical vesicle
- corticotroph, corticotropic cell
- corticotype
- cosmoid scale
- cosmopolitan species
- costa
- costal groove