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sponson  n 
1  (Naval) 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 
 (C19: perhaps from expansion)