Source : Webster's Revised Unabridged Dictionary (1913)

Warder \Ward"er\, n.
   1. One who wards or keeps; a keeper; a guard. ``The warders
      of the gate.'' --Dryden.

   2. A truncheon or staff carried by a king or a commander in
      chief, and used in signaling his will.

            When, lo! the king suddenly changed his mind, Casts
            down his warder to arrest them there. --Daniel.

            Wafting his warder thrice about his head, He cast it
            up with his auspicious hand, Which was the signal,
            through the English spread, This they should charge.
                                                  --Drayton.

Source : WordNet®

warder
     n : the chief official in charge of a prison [syn: {warden}]