waterline

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. Compare load line, Plimsoll line.
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:
1615–25

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
water line
 
n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

waterline
1625, line where the water rises to on the hull of a ship afloat, from water + line.
Online Etymology Dictionary, © 2010 Douglas Harper
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