Sa·ki n. 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.
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.