SQUARE-SAIL, is a sail extended to a yard which
hangs parallel to the horizon, as distinguished from the
other sails which are extended by booms and stays placed
obliquely. This sail is only used in fair winds, or to scud
under in a tempest. In the former case, it is furnished
with a large additional part called the bonnet, which is
then attached to its bottom, and removed when it is ne-
cessary to scud. See SCUDDING.