Source : Webster's Revised Unabridged Dictionary (1913)

Picador \Pic`a*dor"\, n. [Sp.]
   A horseman armed with a lance, who in a bullfight receives
   the first attack of the bull, and excites him by picking him
   without attempting to kill him.

Source : WordNet®

picador
     n : the horseman who pricks the bull with a lance early in the
         bullfight to goad the bull and to make it keep its head
         low