Definition from Wiktionary, the free dictionary
sponson (plural sponsons)
- A projection from the side of a watercraft.
1907, Robert William Chambers, chapter IX, in The Younger Set (Project Gutenberg; EBook #14852), New York, N.Y.: A. L. Burt Company, published 1 February 2005 (Project Gutenberg version), OCLC 4241346:
- 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, […].