'Sponson' definitions:

Definition of 'Sponson'

From: GCIDE

Sponson \Spon"son\ (-s[u^]n), 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. [1913 Webster]