The Collaborative International Dictionary
Lagothrix infumatus
Grison \Gri"son\, n. [F., fr. grison gray, gray-haired, gris gray. See Gris.] (Zo["o]l.)
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.
A South American monkey ( Lagothrix infumatus), said to be gluttonous.