Source : Webster's Revised Unabridged Dictionary (1913)

Appalachian \Ap`pa*la"chi*an\, a.
   Of or pertaining to a chain of mountains in the United
   States, commonly called the {Allegheny} mountains.

   Note: The name Appalachian was given to the mountains by the
         Spaniards under De Soto, who derived it from the
         neighboring Indians. --Am. Cyc.

Source : WordNet®

Appalachian
     adj : in or relating to Appalachia