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south american glutton
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]