Originally: any monkey, esp. one with a short tail (obsolete). Later: spec. any of several large ground-dwelling monkeys constituting the African genus Papio (family Cercopithecidae), characterized by a long doglike snout and large canine teeth, and typically occurring in large social troops on the savannah. Also: any of three related African monkeys that are now placed in other genera, the drill and the mandrill (genus Mandrillus) and the gelada (genus Theropithecus). Frequently with distinguishing word.——牛津当代大辞典

a large monkey that lives in Africa and South Asia.——朗文当代大辞典  @en