First Known Use: 1835
Dictionary
sponson
noun spon·son \ˈspän(t)-sən\
Definition of SPONSON
1
a : a projection (as a gun platform) from the side of a ship or a tank b : an air chamber along a watercraft (as a canoe) to increase stability and buoyancy
2
: a light air-filled structure or a winglike part protruding from the hull of a seaplane to steady it on water
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Origin of SPONSON
perhaps by shortening & alteration from expansion
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