Definition of: cercopithecoid

(sûr′kō·pi·thē′koid) adjective Zool.
Relating to or describing any of a superfamily or group (Cercopithecoidea) of Old World monkeys evolved from prosimian stock by adaptive radiation and including macaques, mandrills, baboons, langurs, and Barbary apes.
—noun A member of this group. [<NL <L cercopithecus <Gk. kerkopithēkos <kerkos tail + pithēkos ape]