Macaque \Ma`caque"\, n. [F. See {Macacus}.] (Zool.) Any one of several species of short-tailed monkeys of the genus {Macaca} (formerly {Macacus}), found in rocky regions of Asia and Africa; as, {Macaca maurus}, the moor macaque of the East Indies. Note: {Macaca mulatta} is the {Rhesus monkey}, much used in biomedical research, and namesake of the Rh factor used in blood typing (due to discovery of that factor in the Rhesus monkey). [1913 Webster +PJC]