Cercopithecidae

noun plural

Cer·​co·​pi·​the·​ci·​dae ˌsər-kō-pə-ˈthē-sə-ˌdē  -ˈthē-kə- 

: a family of primates that includes all the Old World monkeys except the anthropoid apes and is coextensive with a superfamily (Cercopithecoidea)

cercopithecoid

-ˈpith-ə-ˌkȯid  -pə-ˈthē- 

adjective or noun