- cyanogen radical
- cyanohydrin
- cyanometer
- cyanomethylation
- cyanometric titration
- cyanometry
- cyanophycean starch
- cyanophycin
- cyanophycin granule
- cyanophyta
- cyanoplast
- cyanosis
- cyanuramide
- cyathium
- cyazofamid
- Cybele
- Cybele group
- cyber-bullying
- cyberbullying
- cyber civil society
- cyber community
- cyber conflict
- cyber-craft
- cyber crime
- Cyber-crime Convention