Source : Webster's Revised Unabridged Dictionary (1913)

Bull \Bull\, a.
   Of or pertaining to a bull; resembling a bull; male; large;
   fierce.

   {Bull bat} (Zo["o]l.), the night hawk; -- so called from the
      loud noise it makes while feeding on the wing, in the
      evening.

   {Bull calf}.
   (a) A stupid fellow.

   {Bull mackerel} (Zo["o]l.), the chub mackerel.

   {Bull pump} (Mining), a direct single-acting pumping engine,
      in which the steam cylinder is placed above the pump.

   {Bull snake} (Zo["o]l.), the pine snake of the United States.
      

   {Bull stag}, a castrated bull. See {Stag}.

   {Bull wheel}, a wheel, or drum, on which a rope is wound for
      lifting heavy articles, as logs, the tools in well boring,
      etc.

Source : WordNet®

bull snake
     n : any of several large harmless rodent-eating North American
         burrowing snakes [syn: {bull-snake}]