noun.
Any of various small- to medium-sized African monkeys primarily of the tribe Cercopithecini, being chiefly arboreal and having long hind legs, a long tail, and often a brightly colored face.
The Century Dictionary and Cyclopedia
noun.
A French name, very generally adopted as a book-name, for the old-world monkeys of the genus Cercopithecus.
the GNU version of the Collaborative International Dictionary of English
noun.
Any of several long-tailed arboreal African monkeys, of the genera Cercopithecus and Erythrocebus (formerly classified as Cercocebus), such as as the green monkey (Cercopithecus callitrichus) and grivet (Cercopithecus griseo-viridis).