| cygne siffleur | Bewick's swan |
| cygne trompette | trumpeter swan |
| Cygne tuberculé | Mute Swan |
| cygneau | cygnet |
| cygnet | swan |
| Cygnus Air | Cygnus Air |
| Cygwin | Cygwin |
| CYK | CYK algorithm |
| cylindre | cylinder |
| Cylindre de Cyrus | Cyrus cylinder |
| Cylindre de Jefferson | Jefferson disk |
| cylindrique | cylindrical |
| Cylindrophiidae | Cylindrophiidae |
| Cylindrophis ruffus | Cylindrophis ruffus |
| Cylindropuntia | Cylindropuntia |
| Cyllène | Kyllini |
| Cyllèné | Cyllene |
| Cylon | Cylon |
| Cymbalaire | Cymbalaria |
| Cymbalaire des murs | Ivy-leaved Toadflax |
| cymbale | cymbal |
| cymbales | cymbal |
| Cymbeline | Cymbeline |
| Cymodoceaceae | Cymodoceaceae |
| cymophane | cymophane |
| cynanthropie | cynanthropy |
| Cyndi Lauper | Cyndi Lauper |
| Cynegils | Cynegils of Wessex |
| Cynewulf de Wessex | Cynewulf of Wessex |
| cynique | cynic |
| Cyniquement | Cynic |
| Cyniras | Cinyras |
| cynisme | cynicism |
| cynocéphalie | cynocephaly |
| Cynodon | Cynodon |
| Cynognathus | Cynognathus |
| cynologie | cynology |
| cynomys | prairie dog |
| Cynomys parvidens | Utah Prairie Dog |
| Cynops | Fire Belly Newt |
| cynorrhodon | rosehip |
| Cynortas | Cynortas |
| Cynric de Wessex | Cynric of Wessex |
| Cynthia | Cynthia |
| Cynthia Nixon | Cynthia Nixon |
| Cynthia Rothrock | Cynthia Rothrock |
| Cyparisse | Cyparissus |
| Cyperaceae | Cyperaceae |
| Cyperales | Cyperales |
| Cyperus | Cyperus |
| Cyperus papyrus | Cyperus papyrus |
| Cypraea | Cypraeidae |
| Cypress Hill | Cypress Hill |
| Cyprian Kamil Norwid | Cyprian Norwid |
| Cyprien de Carthage | Cyprian |
| Cyprien de Rore | Cipriano de Rore |
| Cyprien Ntaryamira | Cyprien Ntaryamira |
| Cyprinidae | Cyprinid |
| Cypriniformes | Cypriniformes |
| Cyprinodontidae | Pupfish |
| Cyprinodontiformes | Cyprinodontiformes |
| Cyprinus | Cyprinus |
| cypriote | Cypriot |
| Cypripedium | Cypripedium |
| Cypripède acaule | Cypripedium acaule |
| Cyprus Airways | Cyprus Airways |
| Cyprus Broadcasting Corporation | Cyprus Broadcasting Corporation |
| Cyprus Turkish Airlines | Cyprus Turkish Airlines |
| cyprès | cypress |
| Cyprès chauve | Taxodium distichum |
| Cyprès de Baker | Cupressus bakeri |
| Cyprès de Chine | Cupressus funebris |
| Cyprès de Lambert | Cupressus macrocarpa |
| Cyprès de Lawson | Chamaecyparis lawsoniana |
| Cyprès de Leyland | Leyland Cypress |
| Cyprès de marais mexicain | Taxodium mucronatum |
| Cyprès de Nootka | Callitropsis nootkatensis |
| Cyprès de Provence | Cupressus sempervirens |
| Cyprès du Cachemire | Cupressus cashmeriana |
| Cyprès du Maroc | Cupressus atlantica |
| Cyprès du Portugal | Cupressus lusitanica |
| Cyprès du Tassili | Cupressus dupreziana |
| Cypsélos | Cypselus |
| Cyrano de Bergerac | Cyrano de Bergerac |
| Cyriadès | Cyriades |
| Cyric | Cyric |
| Cyril | Cyril |
| Cyril Mar Baselios Malancharuvil | Cyril Mar Baselios |
| Cyril Norman Hinshelwood | Cyril Norman Hinshelwood |
| Cyril Raffaelli | Cyril Raffaelli |
| Cyril Scott | Cyril Scott |
