A type of sail, the upper half of whose luff is fixed to a yard which rises bodily up to the mast and extends more or less vertically above it. The resulting short mast is welcome on dinghies which are left on open moorings, or are trailed on the road, or which are used on waters spanned by low bridges. A jolly good rig for boats up to twenty feet or so, but rare in anything larger. Note that the yard stands almost vertically, in contrast with the acute angle of a Gaff. (See Lug¬sail.)