outrigger
noun
out·rig·ger
ˈau̇t-ˌri-gər
1
a
: a projection with a float or a shaped log at the end attached to a boat to prevent capsizing
b
: 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
2
: a boat equipped with an outrigger
3
: a projecting member run out from a main structure to provide additional stability or to support something
especially
: a projecting frame to support the elevator or tailplanes of an airplane or the rotor of a helicopter
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Merriam-Webster unabridged
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