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: Webster's Revised Unabridged Dictionary (1913)