Source : Webster's Revised Unabridged Dictionary (1913)

Saki \Sa"ki\ (s[=a]"k[i^]), n. [Cf. F. & Pg. saki; probably from
   the native name.] (Zo["o]l.)
   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
         ({P. leucocephala}), and the red-backed, or
         hand-drinking, saki ({P. chiropotes}), are among the
         best-known.