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n. Nautical The distance between the water line and the freeboard deck of a ship.

n. The distance between normal water level and the top of a structure, such as a dam, that impounds or restrains water.

n. The distance between the ground and the undercarriage of an automobile.

n. The vertical distance between the waterline and the uppermost watertight deck of a vessel.

n. The distance between a water level and the top of something that contains or restrains it (such as a dam).

n. The distance between the top of sea ice and the water level.

n. A margin of ground, specified in some cases as two and a half feet in width, in other cases much more, claimed beyond or outside of a fence which incloses a place, as a park or forest.

"Cryosat-2 will measure the thickness of floating ice "freeboard" - the bit sticking above the surface - which will enable scientists to calculate the total thickness of floes by adding that to the 7/8ths of ice "draft" which is submerged."

freeboard deck   

kilter    skag    stempost    wainscoting    bilges