The Collaborative International Dictionary of English v.0.48:

Stringer \String"er\ (str[i^]ng"[~e]r), n.
   1. One who strings; one who makes or provides strings,
      especially for bows.
      [1913 Webster]

            Be content to put your trust in honest stringers.
                                                  --Ascham.
      [1913 Webster]

   2. A libertine; a wencher. [Obs.] --Beau. & Fl.
      [1913 Webster]

   3. (Railroad) A longitudinal sleeper.
      [1913 Webster]

   4. (Shipbuilding) A streak of planking carried round the
      inside of a vessel on the under side of the beams.
      [1913 Webster]

   5. (Carp.) A long horizontal timber to connect uprights in a
      frame, or to support a floor or the like.
      [1913 Webster]

   6. (Newspapers) A reporter or correspondent who works for a
      news agency on a part-time basis, especially one covering
      local news for a newspaper published in a different area;
      -- called also string correspondent.
      [PJC]

   7. (Aviation) a longitudinal supporting structure to
      reinforce the skin of an airplane fuselage.
      [PJC]