| Circumstellar clouds | Nuage circumstellaire |
| Circumstellar disks | Disque circumstellaire |
| Circumstellar dust | Poussiere circumstellaire |
| Circumstellar envelopes | Enveloppe circumstellaire |
| Circumstellar gas | Gaz circumstellaire |
| Circumstellar grains | Grain circumstellaire |
| Circumstellar matter | Matiere circumstellaire |
| Circumstellar shells | Enveloppe circumstellaire |
| circumterrestrial | circumterrestre |
| circumvallation | circonvallation |
| circumvent | tourner |
| circumvention | tromperie |
| Circumvesuviana | Circumvesuviana |
| circus | cirque |
| Circus Circus Las Vegas | Circus Circus |
| Circus Flaminius | Cirque Flaminius |
| circus manager | maître de manège |
| circus master | maître de manège |
| Circus Maximus | Circus Maximus |
| Circus of Maxentius | Cirque de Maxence |
| Circus of Nero | Cirque de Caligula et de Néron |
| circus ring | piste |
| Cirencester | Cirencester |
| Ciriaco de Mita | Ciriaco De Mita |
| Cirié | Cirié |
| Ciro Ferrara | Ciro Ferrara |
| cirque | cirque |
| Cirque de Gavarnie | Cirque de Gavarnie |
| Cirque nouveau | Nouveau cirque |
| cirrhosis | cirrhose |
| cirrus | cirrus |
| Cirrus uncinus cloud | Cirrus uncinus |
| Cirsium arvense | Cirse des champs |
| Cirsium eriophorum | Cirse laineux |
| Cirsium oleraceum | Cirse maraîcher |
| Cirsium palustre | Cirse des marais |
| Cirsium vulgare | Cirse commun |
| Cirth | Cirth |
| CIS | CEI |
| CIS national football team | Équipe de la CEI de football |
| cisalpine | cisalpin |
| Cisalpine Gaul | Gaule cisalpine |
| Cisalpine Republic | République cisalpine |
| Cisalpino | Cisalpino |
| Cisco Career Certifications | Cisco Certified Security Professional |
| Cisco Inter-Switch Link | Inter Switch Link |
| Cisco IOS | Cisco IOS |
| Cisco PIX | Cisco PIX |
| Cisco Systems | Cisco Systems |
| Cisco Unified Communications Manager | Cisco Unified Communications Manager |
| cisgender | cisgenre |
| Ciskei | Ciskeï |
| Cispadane Republic | République cispadane |
| Cisplatin | Cisplatine |
| Cisrhenian Republic | République cisrhénane |
| cissexual | cissexuel |
| cissoid | cissoïde |
| Cistaceae | Cistaceae |
| Cistercian architecture | Art cistercien |
| Cistercians | Ordre cistercien |
| cistern | réservoir |
| Cisticolidae | Cisticolidae |
| Cistus | Ciste |
| Cistus ladanifer | Ciste |
| citadel | forteresse |
| Citadel Miniatures | Citadel Miniatures |
| Citadel of Lille | Citadelle de Lille |
