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plural sponsons
(nautical, aviation, military) A projection from the side of an aircraft, watercraft, or land vehicle. quotations
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, […].
1907 August, Robert W[illiam] Chambers, chapter IX, in The Younger Set, New York, N.Y.: D. Appleton & Company
third-person singular simple present sponsons, present participle sponsoning, simple past and past participle sponsoned
(nautical, aviation, military, transitive, often with the particle "out") To mount on a projection on the side of a vessel. quotations
The belted cruiser Pamiat Azova or Remembrance of Azoff, is 377 feet long. She is an improved Dmitri Dontskoi, and carries her two 8-inch guns in sponsoned barbettes on either broadside
1899, John Scott-Keltie, editor, Statesman's Year-Book 1899