stud·ding sail /ˈstʌdɪŋˌsel, ˈstʌn(t)səl/
Stud·ding sail 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.
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