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1.In meteorology, the height at which the cloud base covers all or part of the sky.
2.The inside lining or planking of a ship's hull extending up the side of the ship to the first deck. This ceiling is therefore on the sides of the ship and what would normally be called a "ceiling" in a house is termed the "overhead" on a ship.
3. An inner skin of the hull often used to add strength in boats having sawn frames. In some cases the ceiling is not structural but merely serves to line the hull for decorative purposes or for ease in cleaning.
A term common to wooden boat design and construction.