mangabeyEtymologySo called by Buffon from Mangaby, in Madagascar, where he erroneously supposed them to be native.mangabey means any of several large, arboreal Old World monkeys in the genera Cercocebus and Lophocebus. Lexicurio rates it Sui generis — a strength score of 90 out of 100.nounAny of several large, arboreal Old World monkeys in the genera Cercocebus and Lophocebus.