Any sharp organ of offense and defense, especially when
   connected with a poison gland, and adapted to inflict a wound by
   piercing; as the caudal sting of a scorpion. The sting of a bee or wasp
   is a modified ovipositor. The caudal sting, or spine, of a sting ray is
   a modified dorsal fin ray. The term is sometimes applied to the fang of
   a serpent. See Illust. of Scorpion.