Term: Luff Image: [{"name":"images\/public\/dictionary\/Luff_bpxltrwv.jpg","usrName":"Luff.jpg","size":22117,"type":"image\/jpeg","thumbnail":"images\/public\/dictionary\/thLuff_05upj1gq.jpg","thumbnail_type":"image\/jpeg","thumbnail_size":22117,"searchStr":"Luff.jpg,!:sStrEnd"}] Definition: The leading edge of a sail.