Studding sail
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Stud´ding sail`
| 1. | (Naut.) A light sail set at the side of a principal or square sail of a vessel in free winds, to increase her speed. Its head is bent to a small spar which is called the studding-sail boom. See Illust. of Sail. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.