1a longitudinal structural piece in a framework, especially that of a ship or aircraft.
2 informal a newspaper correspondent who is retained on a part-time basis to report on events in a particular place:papers relied increasingly on locally based stringers and news agencies
3 [in combination] a reserve sports player holding a specified position in an order of preference:six of the team’s 24 first-stringers are Canadian
4North American a chain with hooks on which caught fish are strung.
5a stringboard.
stringer in other Oxford dictionaries
Definition of stringer in the US English dictionary