Source : Webster's Revised Unabridged Dictionary (1913)

Pricker \Prick"er\, n.
   1. One who, or that which, pricks; a pointed instrument; a
      sharp point; a prickle.

   2. One who spurs forward; a light horseman.

            The prickers, who rode foremost, . . . halted. --Sir
                                                  W. Scott.

   3. A priming wire; a priming needle, -- used in blasting and
      gunnery. --Knight.

   4. (Naut.) A small marline spike having generally a wooden
      handle, -- used in sailmaking. --R. H. Dana, Ir.

Source : WordNet®

pricker
     n 1: a sharp-pointed tip on a stem or leaf [syn: {spine}, {thorn},
           {prickle}, {sticker}]
     2: an awl for making small holes for brads or small screws
        [syn: {bradawl}]