(1):
(n.) The claw of a predaceous bird or animal, especially the claw of a bird of prey.
(2):
(n.) One of certain small prominences on the hind part of the face of an elephant's tooth.
(3):
(n.) The shoulder of the bolt of a lock on which the key acts to shoot the bolt.
(4):
(n.) A kind of molding, concave at the bottom and convex at the top; - usually called an ogee.