One of the Old World Quadrumana, of the genera Cynocephalus and Papio; the dog-faced ape. Baboons have dog- like muzzles and large canine teeth, cheek pouches, a short tail, and naked callosities on the buttocks. They are mostly African. See Mandrill, and Chacma, and Drill an ape.
- Any of several large terrestrial African and Asian monkeys of the family Cercopithecidae, especially of the genus Papio or Chaeropithecus and related genera, characterized by an elongated, doglike muzzle, a short tail, and bare calluses on the buttocks.
- Slang A brutish person; a boor.