water line

American  

[waw-ter lahyn] / ˈwɔ tər ˌlaɪn /

Or waterline

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.

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.

7. waterline, the slightly wet inner rim of skin between the upper or lower eyelashes and the eye, especially with reference to the use of eyeliner.

   Apply pencil eyeliner to your upper and lower waterlines.

---

water line British  

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

---

Etymology

Origin of water line

First recorded in 1615–25

Example Sentences

At the same time, its older infrastructure, such as water lines and septic systems, needs to be upgraded to current codes.

From The Wall Street Journal

After concrete unexpectedly blocked the water line, water supply restoration was delayed.

From Los Angeles Times

Further assessments, however, found severe impacts below the water line to infrastructure “that supports the safe and functional operation of the harbor.”

From Los Angeles Times

The tank is connected to a high-pressure water line so that it can be refilled rapidly, thereby increasing the rate at which firefighting aircraft can perform water drops.

From Los Angeles Times

In those stories, there were no overhead wires to bury or water lines to move.

From Los Angeles Times