A large genus of Old World monkeys (family Cercopithecidae) that includes the macaque and rhesus monkeys, and the Barbary apes. M. mulatta, the rhesus monkey, is used as a research animal. [Pg. macaco, monkey]
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Ma·ca·ca mə-'käk-ə n a genus of Old World monkeys including the rhesus monkey (M. mulatta) and other macaques
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Ma·ca·ca (mə-kahґkə) the macaques, a genus of monkeys of the family Cercopithecidae. M. fasciculaґris is the cynomolgus monkey and M. mulatґta is the rhesus monkey, both used in laboratory research.Medical dictionary. 2011.