| circulatory | circulatorio |
| Circulatory system | Aparato circulatorio |
| circumbendibus | rodeo |
| circumcise | circuncidar |
| circumcised | circuncidado |
| circumcision | circuncisión |
| circumference | circunferencia |
| circumflex | circunflejo |
| circumlocution | rodeo |
| circumnavigate | rodear |
| circumnavigation | circunnavegación |
| Circumplanetary matter | Materia circumplanetaria |
| Circumpolar star | Circumpolar |
| circumscribe | circunscribir |
| Circumscribed circle | Circuncentro |
| circumscription | circunscripción |
| circumspect | cauto |
| circumspection | circunspección |
| circumspectness | precaucion |
| circumstance | condición |
| circumstances | condición |
| circumstances beyond one's control | circunstancias fuera del alcance de uno |
| circumstantial | circunstancial |
| circumstantial evidence | prueba circunstancial |
| circumstantially | circunstancialmente |
| Circumstellar cloud | Nube circunestelar |
| Circumstellar disk | Disco circumestelar |
| Circumstellar dust | Polvo circumestelar |
| Circumstellar envelope | Envoltura circumestelar |
| Circumstellar gas | Gas circumestelar |
| Circumstellar grain | Grano circumestelar |
| Circumstellar matter | Materia circumestelar |
| Circumstellar shell | Envoltura circumestelar |
| circumvallation | circunvalación |
| circumvent | impedir |
| circumvention | trampa |
| circus | circo |
| circus manager | maestro de ceremonias |
| circus master | maestro de ceremonias |
| Circus Maximus | Circo Máximo |
| Ciriaco de Mita | Ciriaco De Mita |
| Ciriaco Pizzicolli | Ciríaco de Ancona |
| cirl bunting | escribano soteño |
| Ciro Ferrara | Ciro Ferrara |
| Cirque de Gavarnie | Circo de Gavarnie |
| Cirque du Soleil | Cirque du Soleil |
| cirrhosis | cirrosis |
| cirrocumulus | cirrocúmulo |
| cirrus | cirro |
