talon

Etymology

From Middle English talon, taloun, from Old French talon (“heel, spur”), from Medieval Latin tālōnem, from Vulgar Latin *tālōnis, from Latin tālus (“ankle”).

noun

1. A sharp, hooked claw of a bird of prey or other predatory animal.
2. (zoology) One of certain small prominences on the hind part of the face of an elephant's tooth.
3. (architecture) A kind of moulding, concave at the bottom and convex at the top; an ogee. (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.
   The locks were constructed with two or three levers, and sometimes with a common tumbler. The talon is the secret; for after locking the bolt out, the key is turned round again quietly to catch the nib and force the talon up 1856, George Price, A Treatise on Fire and Thief-proof Depositories, and Locks
5. (card games) The remaining stock of undealt cards.
6. (finance, historical) A document that could be detached and presented in exchange for a block of further coupons on a bond, when the original block had been used up.