Proper noun
Adyghe
A Northwest Caucasian language spoken in the Republic of Adygea, in the Russian Federation.
Synonyms: Adygean, Adygeyan, West Circassian
But the Grebensky (Row) Cossacks (the part of Terek Cossacks) with deep Adyghe roots because of intermarriages, still speak an old northern Russian Viatka dialect. Source: Internet