waterline

noun

wa·​ter·​line ˈwȯ-tər-ˌlīn How to pronounce waterline (audio)
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
b
: shoreline sense 1

Examples of waterline in a Sentence

We repaired the hull below the waterline.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Deeper tones on the upper waterline can add definition, while a soft beige on the lower waterline can add brightness. — Loren Savini, Allure, 20 May 2026 Ideal for lash line and waterline, the creamy bendable formula comes in seven sultry shades for a perfect look anytime, no touch-ups needed. — ABC News, 16 June 2026 At the same time, her eyes were free of the ultimate Millennial marker, winged liner, and colored with a melting pot of brown, bronze and dusty gray shadow, visible in her waterline, too. — Kaleigh Werner, Footwear News, 2 July 2026 The subs never actually submerged—passengers simply sat below the lagoon’s waterline—but the ride embodied a growing appetite for underwater tourism. — Bill Gourgey, Popular Science, 2 July 2026 See All Example Sentences for waterline

Word History

First Known Use

circa 1625, in the meaning defined above

Time Traveler
The first known use of waterline was circa 1625

Phrases Containing waterline

Rhymes for waterline

See All Rhymes for waterline

Browse Nearby Words

water lime
waterline
waterline model
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Cite this Entry

“Waterline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/waterline. Accessed 7 Jul. 2026.

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Kids Definition

waterline

noun
wa·​ter·​line ˈwȯt-ər-ˌlīn How to pronounce waterline (audio)
ˈwät-
: a line marked on the outside of a ship that matches the surface of the water when the ship floats evenly
Last Updated: - Updated example sentences
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