Definition of grison
1
plural -s
: any of various South American nearly plantigrade carnivorous mammals of the genus Grison (especially G. vittatus) that resemble large weasels, are blackish below and gray above, and are often domesticated by the natives though very destructive to poultry
2
capitalized
[New Latin, from French grison]
: a genus of Mustelidae comprising the grisons 
