any slender agile Old World monkey of the genus Cercopithecus, inhabiting wooded regions of Africa and having long hind limbs and tail and long hair surrounding the face
Word origin
C19: from French, of unknown origin
guenon in American English
(gəˈnoʊn; gəˈnɑn)
noun
any of a genus (Cercopithecus) of long-tailed African monkeys, including the green monkey and grivet