Pounder /(?)/

Pound·er

Pounder

n.
  1. One who, or that which, pounds, as a stamp in an ore mill.
  2. An instrument used for pounding; a pestle.
  3. A person or thing, so called with reference to a certain number of pounds in value, weight, capacity, etc.; as, a cannon carrying a twelve-pound ball is called a twelve pounder.