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 ]

The Collaborative International Dictionary of English v.0.48:

Durukuli \Du`ru*ku"li\, n. (Zool.)
   A small, nocturnal, South American monkey of the genus
   Aotus (formerly Nyctipthecus trivirgatus). The owl
   monkey. See douroucouli. [Written also douroucouli.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

douroucouli
    n 1: nocturnal monkey of Central America and South America with
         large eyes and thick fur [syn: douroucouli, Aotus
         trivirgatus]