Source : Webster's Revised Unabridged Dictionary (1913)

Talon \Tal"on\, n. [F., heel, spur, LL. talo, fr. L. talus the
   ankle, heel.]
   1. The claw of a predaceous bird or animal, especially the
      claw of a bird of prey. --Bacon.

   2. (Zo["o]l.) One of certain small prominences on the hind
      part of the face of an elephant's tooth.

   3. (Arch.) A kind of molding, concave at the bottom and
      convex at the top; -- usually called an {ogee}.

   Note: When the concave part is at the top, it is called an
         {inverted talon}.

   4. The shoulder of the bolt of a lock on which the key acts
      to shoot the bolt. --Knight.