Source : Webster's Revised Unabridged Dictionary (1913)

Circassian \Cir*cas"sian\, a.
   Of or pertaining to Circassia, in Asia. -- n. A native or
   inhabitant of Circassia.

Source : WordNet®

Circassian
     n 1: a member of a Caucasian people living in the Caucasus but
          not speaking an Indo-European language
     2: a northern Caucasian language spoken by the Circassian
        people