lugsail [
'lʌgseil]
n. 斜桁四角帆
lugsail[ noun ]
a sail with four corners that is hoisted from a yard that is oblique to the mast
<noun.artifact>
Lugsail \Lug"sail`\, n. (Naut.)
A square sail bent upon a yard that hangs obliquely to the
mast and is raised or lowered with the sail. --Totten.