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sponson (plural sponsons)

  1. A projection from the side of a watercraft.
    • 1907, Robert W. Chambers, chapter IX, The Younger Set:
      He and Gerald usually challenged the rollers in a sponson canoe when Gerald was there for the weekend; or, when Lansing came down, the two took long swims seaward or cruised about in Gerald's dory, clad in their swimming-suits ; and Selwyn's youth became renewed in a manner almost ridiculous, [].