Term: Rubrail Image: [{"name":"images\/public\/dictionary\/Rubrail_7jd50n8o.jpg","usrName":"Rubrail.jpg","size":116943,"type":"image\/jpeg","thumbnail":"images\/public\/dictionary\/thRubrail_sgiodm13.jpg","thumbnail_type":"image\/jpeg","thumbnail_size":26058,"searchStr":"Rubrail.jpg,!:sStrEnd"}] Definition: Protective outer bumper that runs around the boat at the point where the top deck meets the hull.