staysail

A triangular sail hoisted on a stay.

Any sail which hoists upon a stay. See stay, 1.

Any sail extended on a stay.

A fore-and-aft rigged sail whose luff can be affixed to a stay running forward from a mast to the deck, the bowsprit or to another mast.

a fore-and-aft sail set on a stay (as between two masts)