'Lugsail' definitions:

Definition of 'lugsail'

From: WordNet
noun
A sail with four corners that is hoisted from a yard that is oblique to the mast [syn: lugsail, lug]

Definition of 'Lugsail'

From: GCIDE
  • 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. [1913 Webster]