freeboard
free.board \'fre--.bo-(*)rd, -.bo.(*)rd\ n 1: the distance between the waterline and the freeboard deck of a ship 2: the space between the surface of the ground and the undercarriage of an automobile
Webster's English Dictionaryfree.board \'fre--.bo-(*)rd, -.bo.(*)rd\ n 1: the distance between the waterline and the freeboard deck of a ship 2: the space between the surface of the ground and the undercarriage of an automobile