Source : Webster's Revised Unabridged Dictionary (1913)

Turkish \Turk"ish\, a.
   Of or pertaining to Turkey or the Turks. -- n. The language
   spoken by Turks, esp. that of the people of Turkey. --
   {Turk"ish*ly}, adv. -- {Turk"ish*ness}, n.

Source : WordNet®

Turkish
     adj : of or relating to or characteristic of Turkey or its people
           or language; "Turkish towels"

Turkish
     n : a Turkic language spoken by the Turks