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]
" The black saki (Pithecia satanas), the white-headed (P. leucocephala), and the red-backed, or hand-drinking, saki (P. chiropotes), are among the best-known."
[1913 Webster]