Source : Webster's Revised Unabridged Dictionary (1913)

Turnkey \Turn"key`\, n.; pl. {Turnkeys}.
   1. A person who has charge of the keys of a prison, for
      opening and fastening the doors; a warder.

   2. (Dentistry) An instrument with a hinged claw, -- used for
      extracting teeth with a twist.

Source : WordNet®

turnkey
     n : someone who guards prisoners [syn: {prison guard}, {jailer},
          {jailor}, {gaoler}, {screw}]

Source : Free On-Line Dictionary of Computing

turn-key
     
         A term which describes a system
        (hardware and software) which can be used for a specific
        application without requiring further programming or software
        installation.  The user can just "turn the key" (switch it on)
        and use it.
     
        (1995-02-06)