| Cuthbert Sebastian | Cuthbert Sebastian |
| Cuthred de Wessex | Cuthred of Wessex |
| cuticulaire | cuticular |
| cuticule | cuticle |
| cutine | cutin |
| Cuttura | Kythira |
| cuve | vat |
| Cuve de photographe | Vána |
| Cuve à lessive | Pan |
| Cuve à mazout | Oil storage tank |
| cuver | sleep in |
| Cuver son vin | To sleep late |
| cuvette | toilet |
| cuvette de toilette | water closet |
| cuvette des cabinets | toilet |
| Cuvette-Ouest | Cuvette-Ouest Region |
| Cuxhaven | Cuxhaven |
| Cuy | Cuy |
| Cuyahoga | Cuyahoga River |
| Cuyo | Cuyo |
| Cuyuni | Cuyuni River |
| Cuz | Cuz |
| Cuzco | Cusco |
| Cuzdrioara | Cuzdrioara |
| CV | CV |
| CVF | Queen Elizabeth class aircraft carrier |
| CVO | CVO |
| CW-complexe | CW complex |
| Cwichelm | Cwichelm of Wessex |
| CX | CX |
| CY | CY |
| Cy Twombly | Cy Twombly |
| Cyan | Cyan |
| Cyan magenta jaune noir | CMYK color model |
| cyanate | cyanate |
| cyano- | cyano- |
| Cyanoacetylene | Cyanoacetylene |
| Cyanoacétylène | Cyanoacetylene |
| cyanobacteria | blue-green alga |
| cyanobactérie | blue-green alga |
| Cyanocitta | Cyanocitta |
| Cyanodiacetylene | Cyanodiacetylene |
| Cyanodiacétylène | Cyanodiacetylene |
| Cyanoliseus patagonus | Burrowing Parakeet |
| Cyanopolyyne | Cyanopolyyne |
| cyanure | potassium cyanide |
| Cyanure d'hydrogène | Hydrogen cyanide |
| cyanure de potassium | potassium cyanide |
| Cyathe | Cyathium |
| Cyathea | Cyathea |
| Cyathea dealbata | Cyathea dealbata |
| Cyaxare | Cyaxares |
| Cybaeidae | Cybaeidae |
| cyber- | cyber- |
| cyberattaque | cyberattack |
| Cybercafé | Cybercafé |
| cybercriminalité | cybercrime |
| cybercriminel | cybercriminal |
| Cyberfolio | Electronic portfolio |
| cyberguerre | cyberwarfare |
| Cyberjaya | Cyberjaya |
| cybernéticien | cyberneticist |
| cybernéticienne | cyberneticist |
| cybernétique | cybernetics |
| Cyberpunk | Cyberpunk |
| cyberterrorisme | cyberterrorism |
| Cybill Shepherd | Cybill Shepherd |
| cyborg | cyborg |
| Cybride | Cybrid |
| Cybèle | Cybele |
| Cycadaceae | Cycas |
| Cycas | Cycas |
| Cycas circinalis | Cycas circinalis |
| Cycas du Japon | Cycas revoluta |
| Cyclades | Cyclades |
| cyclamate | cyclamate |
| cyclamen | cyclamen |
| cyclane | cycloalkane |
| Cyclanthaceae | Cyclanthaceae |
| cycle | cycle |
| cycle biogéochimique | biogeochemical cycle |
| cycle biologique | biological cycle |
| Cycle carbone-azote-oxygène | CNO cycle |
| Cycle cellulaire | Cell cycle |
| Cycle CNO | CNO cycle |
| Cycle combiné | Combined cycle |
| Cycle de Beau de Rochas | Four-stroke cycle |
| Cycle de Calvin | Calvin cycle |
| Cycle de Carnot | Carnot heat engine |
| Cycle de Doha | Doha Development Round |
| Cycle de développement | Software development process |
| Cycle de Fondation | The Foundation Series |
