Definition of sponson in English:


Line breaks: spon|son
Pronunciation: /ˈspɒns(ə)n


  • 1A projection on the side of a boat, ship, or seaplane, in particular:
    More example sentences
    • The three davits for the deployment of landing craft and the patrol boat are relocated to a sponson installed on the port side of the ship instead of on the flight deck.
    • The battery door is on the aft end of the sponson that houses the port main landing gear.
    • At one critical point in the match, a streaker emerged from the hangar, running across the flight deck (in just shorts and hat), disappearing down onto one of the aft sponsons.
  • 1.1A gun platform standing out from a warship’s side.
    More example sentences
    • By Christmas the new bridge wing, gun deck and other sponsons had been replaced, and shortly after all the wiring and ship's fittings were replaced and set to work.
  • 1.2A short subsidiary wing that serves to stabilize a seaplane.
  • 1.3A buoyancy chamber fitted to a boat’s hull, especially on a canoe.
  • 1.4A triangular platform supporting the wheel on a paddle steamer.


mid 19th century: of unknown origin.

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Pronunciation: mɪˈlɔːd
used to address an English nobleman