Macacus \Ma*ca"cus\, n. [NL., a word of African origin. Cf. {Macaco}, {Macaque}.] (Zool.) A genus of monkeys, found in Asia and the East Indies, now usually called {Macaca}. They have short tails and prominent eyebrows. See also {Macaca}. [1913 Webster]
Macaca \Macaca\ prop. n. A genus of macaques including the rhesus monkey ({Macaca mulatta}), much used in laboratory biomedical research. Formerly called {Macacus}. Syn: genus {Macaca}. [WordNet 1.5]