Webster's English Dictionary

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outrigger

out.rig.ger \'au.t-.rig-*r\ n 1a: a projecting spar with a shaped log at 
   the end attached to a canoe to p revent upsetting 1b: a spar or projecting 
   beam run out from a ship's side to help secure the  masts or from a mast to 
   extend a rope or sail 1c: a projecting support for an oarlock; also : a 
   boat so equipped  2: a projecting member run out from a main structure to 
   provide additional  stability or to support an extension; esp : a 
   projecting frame to support the elevator or tail planes of an airplane or 
   the rotor of a helicopter