cercopithecine
Concise Oxford English Dictionary © 2008 Oxford University Press:
cercopithecine /ˌsəːkə(ʊ)ˈpɪθɪsiːn/ Zoology
▶adjective relating to or denoting monkeys of a subfamily (Cercopithecinae ) that includes the macaques, mangabeys, baboons, and guenons. ▶noun a cercopithecine monkey.
– origin based on Gk kerkopithēkos ‘long-tailed monkey’, from kerkos ‘tail’ + pithēkos ‘ape’.
'cercopithecine' also found in these Oxford entries:

