noun wa·ter·line \ˈw-tər-ˌlīn, ˈwä-\

the waterline : the level that water reaches on the side of a ship

: a horizontal mark on a wall or other surface that was made by water during a flood and that shows how high the water was

Full Definition of WATERLINE

:  a line that marks the level of the surface of water on something: as
a (1) :  the point on the hull of a ship or boat to which the water rises
(2) :  a line marked on the outside of a ship that corresponds with the water's surface when the ship is afloat on an even keel under specified conditions of loading
b :  shoreline 1

Examples of WATERLINE

  1. We repaired the hull below the waterline.

First Known Use of WATERLINE

circa 1625


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