| CW power | Dauerstrichleistung |
| CW radar | Dauerstrichradar |
| CW transmitter | Gleichwellensender |
| Cwichelm of Wessex | Cwichelm |
| cwm | Kar |
| Cwmbran | Cwmbran |
| CX | CX |
| CY | CY |
| Cy Twombly | Cy Twombly |
| Cy Young Award | Cy Young Award |
| CYA : see ya | seh dich wieder |
| CYA : see you again | seh dich wieder |
| CYA: See you! | Wir sehen uns später! |
| cyamemazine | Cyamemazin |
| cyamid crustaceans | Walläuse |
| cyan | Aquamarin |
| cyan filter | Blaugrün-Filter |
| cyanamide | Cyanamid |
| cyanamide nitrogen fixation process | Kalkstickstoffverfahren zur Stickstoffgewinnung |
| cyanate | Cyanat |
| cyanates | Zyanate |
| Cyane | Cyane |
| cyanephridosis | Ausscheidung von blauem Schweiß |
| cyanic acid | Cyansäure |
| cyanic chloride | Cyanchlorid |
| cyanide | Kaliumzyanid |
| cyanide intoxication | Blausäurevergiftung |
| cyanide murder | Cyanid-Mord |
| cyanide murderer | Cyanid-Mörder |
| Cyanide of potassium | Kaliumcyanid |
| cyanide poisoning | Blausäurevergiftung |
| cyanides | Cyanide |
| cyanite | Cyanit |
| cyanoacetic acid | Cyanessigsäure |
| cyanoacrylate adhesive | Cyanacrylat-Kleber |
| cyanoacrylate glue | Cyanacrylatklebstoff |
| cyanoamine | Cyanamid |
| cyanoazane | Cyanamid |
| cyanobacteria | Blaualgen |
| cyanocobalamin | Zyanokobalamin |
| cyanocobalamine | Cyanocobalamin |
| cyanoderma | Blaufärbung der Haut |
| cyanogen | Cyan |
| cyanogen agent | Blutkampfstoff |
| cyanogen amide | Cyanogenamid |
| cyanogen chloride | Chlorcyan |
| cyanogen iodide | Cyanogeniodid |
| cyanogen nitride | Cyanamid |
| cyanogenamide | Cyanogenamid |
| cyanogran | Natriumcyanid |
| cyanomercury | Quecksilbercyanid |
| cyanometer | Cyanometer |
| cyanometry | Cyanometrie |
| cyanopathy | Zyanose |
| cyanophores | Zyanophoren |
| cyanophyta | Blaualgen |
| cyanopia | Blausichtigkeit |
| cyanopindolol | Cyanopindolol |
| Cyanoramphus | Cyanoramphus |
| cyanosis | Zyanose |
| cyanosis of lips | Lippenzyanose |
| cyanosis of the newborn | Blausucht des Neugeborenen |
| cyanosis of the skin | Hautzyanose |
| cyanotic | zyanotisch |
| cyanotype | Lichtpause |
| Cyathea | Cyathea |
| Cyathea dealbata | Silberfarn |
| Cyatheales | Baumfarne |
| Cyathium | Cyathium |
| cyathus | Brutbecher |
| Cybele | Kybele- und Attiskult |
| cyber | Cyber |
| cyber attack | Cyberattacke |
| cyber grooming | Cyber-Grooming |
