outrigger /(?)/

out·rig·ger

outrigger

n.
  1. Any spar or projecting timber run out for temporary use, as from a ship's mast, to hold a rope or a sail extended, or from a building, to support hoisting teckle.
  2. A projecting support for a rowlock, extended from the side of a boat. (Naut.)
  3. A projecting frame used to support the elevator or tail planes, etc. (Aeronautics)