| co- | co- |
| co-beau-père | co-father-in-law |
| co-belle-mère | co-mother-in-law |
| co-incinération | co-incineration |
| co-produit | by-product |
| Co-trimoxazole | Co-trimoxazole |
| co-épouse | co-wife |
| coaccusé | codefendant |
| coaccusée | codefendant |
| Coacquéreur | Joint purchaser |
| coadjuteur | coadjutor |
| Coadout | Coadout |
| coagulant | coagulant |
| coagulation | coagulation |
| Coagulation intravasculaire disséminée | Disseminated intravascular coagulation |
| coaguler | congeal |
| coagulé | clotted |
| Coahuila | Coahuila |
| Coahuiltecan | Coahuiltecan |
| Coahuilteco | Coahuilteco language |
| Coal Grove | Coal Grove |
| Coalbrookdale | Coalbrookdale |
| coalesceur | coalescer |
| coalition | alliance |
| Coalition albanaise de la vallée de Preševo | Albanian Coalition from Preševo Valley |
| Coalition de partis pour la démocratie | Coalition of Parties for Democracy |
| Coalition démocratique unitaire | Unitarian Democratic Coalition |
| Coalition jamaïcaine | Jamaica coalition |
| Coalition militaire en Irak | Multinational force in Iraq |
| Coalition pan-bleue | Pan-Blue Coalition |
| Coalition pan-verte | Pan-Green Coalition |
| Coalition sociale-libérale | Social-liberal coalition |
| coaltar | coal tar |
| Coarticulation | Coarticulation |
| coassement | croak |
| Coast Guards | The Guardian |
| coati | coati |
| Coati des montagnes | Mountain Coati |
| Coati à nez blanc | White-nosed Coati |
| Coatlicue | Coatlicue |
| coauteur | coauthor |
| coax | coaxial cable |
| coaxial | coaxial |
| cobalt | cobalt |
| Cobalte | Cobalt |
| cobaye | guinea pig |
| Cobham | Cobham |
| Cobit | COBIT |
| Coblence | Koblenz |
| COBOL | COBOL |
| Cobordisme | Cobordism |
| Cobourg | Coburg |
| cobra | cobra |
| Cobra du Cap | Cape Cobra |
| cobra indien | Indian cobra |
| Cobra Verde | Cobra Verde |
| Cobra égyptien | Egyptian cobra |
| Coburg | Coburg |
| Cobá | Coba |
| Cobée grimpante | Cobaea scandens |
| COC Nederland | COC Nederland |
| coca | Coca-Cola |
| coca-cola | Coca-Cola |
| Coca-Cola BlāK | Coca-Cola BlāK |
| Coca-Cola Light | Diet Coke |
| cocagne | Cockaigne |
| cocarde | cockade |
| cocasse | comic |
| cocatrix | cockatrice |
| cocaïne | coke |
| Coccinella | Coccinella |
| Coccinella septempunctata | Coccinella septempunctata |
| coccinelle | ladybird |
| Coccinelle asiatique | Harmonia axyridis |
| Coccinelle ocellée | Anatis ocellata |
| Coccinelle à deux points | Two-spotted lady beetle |
| Coccinellidae | Coccinellidae |
| Coccolithe | Coccolith |
| Coccolithophoridé | Coccolithophore |
| Coccoloba | Coccoloba |
| Coccoloba uvifera | Coccoloba uvifera |
| Coccothraustes | Coccothraustes |
| coccus | coccus |
| coccygien | coccygeal |
| coccyx | coccyx |
| Coccyzus | Coccyzus |
| Cochem | Cochem |
| Cochem-Zell | Cochem-Zell |
| cochenellier | nopal |
| cochenille | cochineal |
| cocher | mark off |
| Cocherel | Cocherel |
| Cochin City | Cochin City |
| Cochinchine | Cochinchina |
| Cochlearia | Cochlearia |
| Cochlearia officinalis | Cochlearia officinalis |
| cochleria | cochleria |
| Cochlodina laminata | Cepaea vindobonensis |
| Cochlospermaceae | Cochlospermaceae |
| cochléaire | cochlear |
| Cochléaire officinale | Cochlearia officinalis |
| cochlée | cochlea |
| cochon | slob |
| cochon d'Inde | guinea pig |
| cochon de lait | sucking pig |
| cochon de terre | aardvark |
| cochonne | slut |
| cochonnet | piglet |
| Cochons de Pink Floyd | Pink Floyd pigs |
| Cockburn Town | Cockburn Town |
| cocker | cocker spaniel |
| Cocker Spaniel anglais | English Cocker Spaniel |
| cockney | Cockney |
| Cockney Rejects | Cockney Rejects |
| cockpit | cockpit |
| Cocktail | Cocktail |
| Cocktail Molotov | Molotov cocktail |
| coco | coke |
| Coco Chanel | Coco Chanel |
| Coco Lapin | Rabbit |
| Coco Lee | CoCo Lee |
| Cocoa | Cocoa |
| COCOMO | COCOMO |
| cocon | cocoon |
| cocorico | cock |
| cocotier | coconut tree |
| cocotier de mer | coco-de-mer |
| cocotte | casserole |
| cocotte-minute | pressure cooker |
| cocu | cuckold |
| cocufier | cuckold |
| Cocyte | Cocytus |
| coda | coda |
| codage | coding |
| Codage arithmétique | Arithmetic coding |
| Codage de Huffman | Huffman coding |
| Codage des caractères chinois | Chinese character encoding |
| Codage Manchester | Manchester code |
| Codage Manchester différentiel | Differential Manchester encoding |
| Codage NRZ | Non-return-to-zero |
| Codage NRZI | Non-return-to-zero |
| CODATA | Committee on Data for Science and Technology |
| code | code |
| code administratif | administrative body |
| Code AITA | IATA airport code |
| Code américain normalisé pour l'échange d'information | American Standard Code for Information Interchange |
| Code banque | Sort Code |
| Code Baudot | Baudot code |
| Code BCH | BCH code |
| Code chiffres-sons | Mnemonic major system |
| code civil | civil law |
| Code civil du Québec | Civil Code of Quebec |
| Code civil suisse | Zivilgesetzbuch |
| code de conduite | code of conduct |
| Code de déontologie | Deontological ethics |
| Code de Golay | Binary Golay code |
