Lugsail definitions

lŭg'səl
A quadrilateral sail that lacks a boom, has the foot larger than the head, and is bent to a yard hanging obliquely on the mast.
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A four-sided sail with the upper edge supported by a yard that is fastened obliquely to the mast.
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(nautical) A quadrilateral sail bent upon a yard that crosses the mast obliquely; a lug.
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Origin of lugsail

Possibly from lug