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(naval architecture)
The intersection of the surface of the water with the side of a ship.
A line painted on the hull of a ship showing the level of the water when the ship is properly trimmed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also shoreline), the line of contact between the water surface of a body of water—such as a lake, river, or sea—and a dry land surface, or shore. The height and shape of a waterline vary owing to fluctuations in the level and changes in the nature of the shore that result from erosion, abrasion, or human activity.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Inside a cistern, the highest water level to which the ball valve should be adjusted to shut off.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

waterline (WL)

waterline (WL)
A system of aircraft location designation. The water line is the measurement of height in inches perpendicular from a horizontal plane located a fixed number of inches below the bottom of the aircraft fuselage.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
That means treating dental unit waterlines is never done either.
The microbial contamination in dental unit waterlines was first described by Blake in 19632.
VistaTab is a tablet used for the cleaning of microbial contaminants in dental unit waterlines. According to Hu-Friedy, the solid tablet quickly dissolves in water to create a non-corrosive solution reportedly more effective than bleach.
In 1993, the CDC recommended that dental waterlines be flushed at the beginning of the clinic day to reduce the microbial load.
Because the organisms live within the waterlines, only heat-sterilized/sterile-disposable bulb syringes or sterile water delivery devices should be used to deliver the sterile water.