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sponson

[spon-suh n] /ˈspɒn sən/
noun
1.
a structure projecting from the side or main deck of a vessel to support a gun or the outer edge of a paddle box.
2.
a buoyant appendage at the gunwale of a canoe to resist capsizing.
3.
Aeronautics. a protuberance at the side of a flying-boat hull, designed to increase lateral stability in the water.
Origin
1825-1835
1825-35; variant of expansion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sponson

sponson

/ˈspɒnsən/
noun
1.
(navy) an outboard support for a gun enabling it to fire fore and aft
2.
a semicircular gun turret on the side of a tank
3.
a float or flotation chamber along the gunwale of a boat or ship
4.
a structural projection from the side of a paddle steamer for supporting a paddle wheel
5.
a structural unit attached to a helicopter fuselage by fixed struts, housing the main landing gear and inflatable flotation bags
Word Origin
C19: perhaps from expansion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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