| croco | crocus |
| Crocodilia | Crocodilia |
| Crocodylia | Crocodilia |
| Crocodylidae | Crocodile |
| Crocodylus | Crocodylus |
| Crocodylus acutus | American Crocodile |
| Crocodylus intermedius | Orinoco Crocodile |
| Crocodylus johnstoni | Freshwater Crocodile |
| Crocodylus mindorensis | Philippine crocodile |
| Crocodylus niloticus | Nile crocodile |
| Crocodylus novaeguineae | New Guinea Crocodile |
| Crocodylus rhombifer | Cuban Crocodile |
| Crocosmia | Crocosmia |
| Crocus minimus | Crocus vernus |
| Crocus sativus | Saffron |
| Croglio | Croglio |
| croissant | croissant |
| Croix | Cross |
| Croke Park | Croke Park |
| cromado | chromium plated |
| cromar | chrome |
| cromatina | chromatin |
| Cromato de potasio | Potassium chromate |
| cromatografía | chromatography |
| cromatografía de gases | gas chromatography |
| Cromatografía en capa fina | Thin layer chromatography |
| Cromatografía líquida | Ion Chromatography |
| Cromatografía líquida de alta resolución | High performance liquid chromatography |
| cromatóforo | chromatophore |
| cromita | chromite |
| Cromlech | Stone circle |
| cromo | print |
| cromosfera | chromosphere |
| cromosoma | chromosome |
| Cromosoma artificial bacteriano | Bacterial artificial chromosome |
| Cromosoma artificial de levadura | Yeast artificial chromosome |
| Cromosoma Filadelfia | Philadelphia chromosome |
| Cromosoma homólogo | Homologous chromosome |
| cromosoma X | X-chromosome |
| cromosómico | chromosomal |
| cromático | chromatic |
| cromátida | chromatid |
| cromóforo | chromophore |
| Cron | Mya |
| Cronay | Cronay |
| Cronia | Kronia |
| cronista | chronicler |
| Crono | Cronus |
| crono- | chrono- |
| Cronoespecie | Chronospecies |
| Cronofilia | Chronophilia |
| cronologia | chronology |
| cronología | chronology |
| Cronología de Dragon Ball | Timeline of Dragon Ball |
| Cronología de inventos | Timeline of historic inventions |
| Cronología de la aviación | Timeline of aviation |
| Cronología de la cosmología | Timeline of cosmology |
| Cronología de la Guerra Civil Española | Spanish Civil War |
| Cronología de la historia de los Estados Unidos | Timeline of United States history |
| Cronología de la ornitología | Timeline of ornithology |
| Cronología de la Segunda Guerra Mundial | Timeline of World War II |
| Cronología de las tecnologías del transporte | Timeline of transportation technology |
| Cronología de las vacunas | Timeline of vaccines |
| Cronología de los reyes de Suecia | List of Swedish monarchs |
| Cronología de los Sistemas Operativos | Operating systems timeline |
| Cronología de reyes de Asiria | Kings of Assyria |
| Cronología de reyes de Cartago | List of Monarchs of Carthage |
| Cronología de Star Wars | Dates in Star Wars |
| Cronología del Antiguo Oriente Próximo | Chronology of the ancient Near East |
| Cronología del Big Bang | Timeline of the Big Bang |
| Cronología del Cine | List of years in film |
| Cronología del cristianismo | Timeline of Christianity |
| Cronología del ferrocarril | Timeline of railway history |
| cronológicamente | chronologically |
| cronológico | chronological |
| cronometraje | timing |
| Cronos | Cronus |
| cronómetro | chronometer |
| croquet | croquet |
| croqueta | croquette |
| Cross docking | Cross-docking |
| Cross River | Cross River State |
| Crossing Jordan | Crossing Jordan |
| Crossoptilon | Crossoptilon |
| Crossoptilon auritum | Blue Eared Pheasant |
| Crossoptilon crossoptilon | White-eared Pheasant |
| Crossoptilon mantchuricum | Brown Eared Pheasant |
| Crossosomataceae | Crossosoma |
| Crossosomatales | Crossosomatales |
| Crotalinae | Crotalinae |
| Crotalus | Crotalus |
| Crotalus durissus | Crotalus durissus |
| Crotaphytidae | Crotaphytidae |
| Crotone | Crotone |
| Crotophaga ani | Smooth-billed Ani |
| Crotophaga sulcirostris | Groove-billed Ani |
| croupier | croupier |
| Crow | Crow Nation |
| Croy | Croy |
| Croydon | London Borough of Croydon |
| cruasán | croissant |
| cruce | junction |
| cruce de carreteras | crossroads |
| Cruce de destinos | Bhowani Junction |
| cruce de trébol | cloverleaf |
