| Noun | 1. | genus Mandrillus - baboons mammal genus - a genus of mammals Cercopithecidae, family Cercopithecidae - Old World monkeys: guenon; baboon; colobus monkey; langur; macaque; mandrill; mangabey; patas; proboscis monkey mandrill, Mandrillus sphinx - baboon of west Africa with a bright red and blue muzzle and blue hindquarters |