Source : Webster's Revised Unabridged Dictionary (1913)

Chickasaws \Chick"a*saws\, n. pl.; sing. {Chickasaw}. (Ethnol.)
   A tribe of North American Indians (Southern Appalachian)
   allied to the Choctaws. They formerly occupied the northern
   part of Alabama and Mississippi, but now live in the Indian
   Territory.

Source : WordNet®

Chickasaw
     n 1: a member of the Muskhogean people formerly living in
          northern Mississippi
     2: the Muskhogean language of the Chickasaw people