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Definition of: sponson
(spon′sən) noun
1. A curved projection from the hull of a vessel or seaplane, to give greater stability or increase the surface area.
2. A similar protuberance on a ship or tank, for storage purposes or for the training of a gun.
3. An air tank built into the side of a canoe, to improve stability and prevent sinking. [Appar. alter. of EXPANSION]
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