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water line

noun
1.
Nautical. the part of the outside of a ship's hull that is just at the water level.
2.
Naval Architecture. any of a series of lines on the hull plans of a vessel representing the level to which the vessel is immersed or the bottom of the keel.
3.
the line in which water at its surface borders upon a floating body.
4.
water level (def 2).
5.
Also called watermark. a line indicating the former level or passage of water:
A water line all around the cellar served as a reminder of the flood.
6.
a pipe, hose, tube, or other line for conveying water.
Also, waterline.
Origin
1615-1625
1615-25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for waterline

water line

noun
1.
a line marked at the level around a vessel's hull to which the vessel will be immersed when afloat
2.
a line marking the level reached by a body of water
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for waterline
n.

1620s, line where the water rises to on the hull of a ship afloat, from water (n.1) + line (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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