noun.
A horseman in a bullfight who lances the bull's neck muscles so that it will tend to keep its head low for the later stages of the fight.
The Century Dictionary and Cyclopedia
noun.
In bull-fighting, one of the horsemen armed with a lance who commence the combat in the arena by pricking the bull to madness with their weapons, but purposely avoid disabling him.
the GNU version of the Collaborative International Dictionary of English
noun.
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.