The Collaborative International Dictionary of English v.0.48:

Choctaws \Choc"taws\, n. pl.; sing. Choctaw. (Ethnol.)
   A tribe of North American Indians (Southern Appalachian), in
   early times noted for their pursuit of agriculture, and for
   living at peace with the white settlers. They are now one of
   the civilized tribes of the Indian Territory.
   [1913 Webster]