SPONSON
Noun
sponson (plural sponsons)
(nautical, aviation, military) A projection from the side of an aircraft, watercraft, or land vehicle.
Verb
sponson (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.
Source: Wiktionary
Spon"son, n. (Shipbuilding)
(a) One of the triangular platforms in front of, and abaft, the
paddle boxes of a steamboat.
(b) One of the slanting supports under the guards of a steamboat.
(c) One of the armored projections fitted with gun ports, used on
modern war vessels.
Source: Webster’s Unabridged Dictionary 1913 Edition