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