- cynomolgusA long-tailed macaque (Macaca fascicularis), native to Asia, that feeds on shellfish.
- cynanthropyA delusion in which a person believes he or she is transformed into a dog.
- cyno-Of or pertaining to dogs.
- cynodontAny of several small carnivorous synapsids in the clade Cynodontia, ancestral to mammals and extinct close relatives.