Cercopithecoid

Relating to or resembling Old World monkeys, a group of primates that includes baboons, macaques, and guenons.

From Greek 'kerkopithecos' (tail-monkey), combining 'kerkos' (tail) and 'pithecos' (ape/monkey). The suffix '-oid' means 'resembling' or 'of the nature of.' This taxonomic term emerged in the 19th century to classify primates with specific tail and facial features.