any of various anthropoid primates of the family Cercopithecidae, of Africa, the Arabian peninsula, and Asia, typically having a hairless face, forward- or downward-directed nostrils, relatively short arms, flat nails, and either having a rudimentary tail or using the tail for balance rather than grasping, and including the baboon, colobus monkey, guenon, langur, macaque, mandrill, mangabey, patas, proboscis, and talapoin.
