Saki \Sa"ki\ (s[=a]"k[i^]), n. [Cf. F. & Pg. saki; probably from the native name.] (Zool.) Any one of several species of South American monkeys of the genus {Pithecia}. They have large ears, and a long hairy tail which is not prehensile. [1913 Webster] Note: The black saki ({Pithecia satanas}), the white-headed ({Pithecia leucocephala}), and the red-backed, or hand-drinking, saki ({Pithecia chiropotes}), are among the best-known. [1913 Webster]