waterline
noun
wa·ter·line
ˈwȯ-tər-ˌlīn
ˈwä-
: a line that marks the level of the surface of water on something: such 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
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Merriam-Webster unabridged
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