Spon″son (–sŭn), 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.