(n) (used only in combination) something weighing a given number of pounds, Example:the fisherman caught a 10-pounder; their linemen are all 300-pounders
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
n. 1. One who, or that which, pounds, as a stamp in an ore mill. [ 1913 Webster ]
2. An instrument used for pounding; a pestle. [ 1913 Webster ]
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. [ 1913 Webster ]
☞ Before the English reform act of 1867, one who was an elector by virtue of paying ten pounds rent was called a ten pounder. [ 1913 Webster ]