The Collaborative International Dictionary of English v.0.48:

Douroucouli \Dou`rou*cou"li\, n. (Zool.)
   A small, nocturnal, South American monkey of the genus
   Aotus (formerly Nyctipithecus trivirgatus), with large
   owl-like eyes; hence, the common name owl monkey. [Written
   also Durukuli and dourikuli.]
   [1913 Webster +PJC ]