lugsail

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.

A quadrilateral sail bent upon a yard that hangs obliquely to the mast at about one third of its length: a common rig for boats of men-of-war. Also lug.

A square sail bent upon a yard that hangs obliquely to the mast and is raised or lowered with the sail.

A quadrilateral sail bent upon a yard that crosses the mast obliquely; a lug.

a sail with four corners that is hoisted from a yard that is oblique to the mast