Source : Webster's Revised Unabridged Dictionary (1913)

Cornish \Cor"nish\ (k?r"n?sh), a.
   Of or pertaining to Cornwall, in England.

   {Cornish chough}. See {Chough}.

   {Cornish engine}, a single-acting pumping engine, used in
      mines, in Cornwall and elsewhere, and for water works. A
      heavy pump rod or plunger, raised by the steam, forces up
      the water by its weight, in descending.

Cornish \Cor"nish\, n.
   The dialect, or the people, of Cornwall.

Source : WordNet®

Cornish
     n 1: a Celtic language formerly spoken in Cornwall
     2: English breed of compact domestic fowl; raised primarily to
        crossbreed to produce roasters