grison

from WordNet (r) 3.0 (2006)

grison
    n 1: carnivore of Central America and South America resembling a
         weasel with a greyish-white back and dark underparts [syn:
         {grison}, {Grison vittatus}, {Galictis vittatus}]

from The Collaborative International Dictionary of English v.0.48

Grison \Gri"son\, n. [F., fr. grison gray, gray-haired, gris
   gray. See {Gris}.] (Zool.)
   (a) A South American animal of the family Mustelidae
       ({Galictis vittata}). It is about two feet long,
       exclusive of the tail. Its under parts are black. Also
       called {South American glutton}.
   (b) A South American monkey ({Lagothrix infumatus}), said to
       be gluttonous.
       [1913 Webster]