waterline
Sign in to savethumb|Waterline of a ship. The mark above the waterline indicates the Plimsoll line The waterline is the line where the hull of a ship meets the surface of the water.
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thumb|Waterline of a ship. The mark above the waterline indicates the Plimsoll line The waterline is the line where the hull of a ship meets the surface of the water.
A waterline can also refer to any line on a ship's hull that is parallel to the water's surface when the ship is afloat in a level trimmed position. Hence, waterlines are a class of "ships lines" used to denote the shape of a hull in naval architecture lines plans.