n. A quadrilateral sail bent upon a yard that crosses the mast obliquely; a lug.
the GNU version of the Collaborative International Dictionary of English
n. A square sail bent upon a yard that hangs obliquely to the mast and is raised or lowered with the sail.
The Century Dictionary and Cyclopedia
n. 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.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a sail with four corners that is hoisted from a yard that is oblique to the mast
Word Usage
"It's a Scottish lugsail dinghy of the older variety and she's a beauty."