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.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "lugsail" in a sentence
"It's a Scottish lugsail dinghy of the older variety and she's a beauty."
"The mainsail and lugsail could be used to run before the wind."
"Many carried a bourcet, or lugsail, on the foremast see below for an explanation, or two lugsails on the fore-and mainmasts as their only rig.15"