(1):

(n.) A boiler in which clay is beaten by a wheel to a creamy consistence.

(2):

(n.) One who, or that which, plunges; a diver.

(3):

(n.) A long solid cylinder, used, instead of a piston or bucket, as a forcer in pumps.

(4):

(n.) One who bets heavily and recklessly on a race; a reckless speculator.

(5):

(n.) The firing pin of a breechloader.