outrigger

(-rig′ər)

noun

  1. any temporary support extending out from a main structure
    1. any of a variety of frameworks extended beyond the rail of a ship for various purposes
    2. a brace holding an oarlock out from the side of a boat, to give the rower more leverage
    3. a timber or other float rigged out from the side of certain canoes to prevent tipping; also, a canoe of this type
  2. a sparlike projection, for supporting the lesser airfoils of an airplane or the propellers or engines on an airship

See outrigger in American Heritage Dictionary 4

noun
  1. Nautical
    a. A projecting beam or spar run out from the side of a vessel to help in securing the masts or from a mast to be used in extending a rope or sail.
    b. A long thin float attached parallel to a seagoing canoe by projecting spars as a means of preventing it from capsizing.
    c. A vessel fitted with such a float or beam.
    d. A support for an oarlock projecting from the side of a racing shell.
    e. A racing shell fitted with such a support.
  2. A projecting frame extending laterally beyond the main structure of a vehicle, aircraft, or machine to stabilize the structure or support an extending part.

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