wa·​ter·​line | \ ˈwȯ-tər-ˌlīn How to pronounce waterline (audio) , ˈwä- \

Definition of waterline

: 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

Examples of waterline in a Sentence

We repaired the hull below the waterline.
Recent Examples on the Web Fully loaded, Derreumaux’s seat will be about 5 inches above the waterline. Gregory Thomas, San Francisco Chronicle, "Marin kayaker to embark on epic solo paddle from S.F. to Hawaii," 22 Apr. 2021 Whereas training seminars might offer people general advice about how to meet one’s personal objectives above the waterline, they’re not designed to transform someone at the root. Sandra Oliver, Forbes, "Understanding The Key Tenets Of Coaching," 12 Apr. 2021 While the previous attacks on shipping targeted only commercial vessels and caused cosmetic damage above the waves, Tuesday's blast apparently blew through the hull of the Saviz below its waterline. Jon Gambrell, Star Tribune, "Analysis: Attack on Iran ship off Yemen escalates shadow war," 8 Apr. 2021 Deploy crisis management protocols for those with major, temporary impacts. Evolve through those with minor, enduring impacts. Push a restart button when hit below the waterline with a major, enduring impact. George Bradt, Forbes, "Mastering The Seven Stages Of Executive Onboarding," 6 Apr. 2021 To achieve this, the structure is equipped with a set of propellers and thrusters below the waterline that are controlled by a sophisticated computer system. Rachel Cormack, Robb Report, "This Floating Hotel Concept in Qatar Rotates 360 Degrees to Generate Its Own Electricity," 30 Mar. 2021 The broken power -- the broken waterline is really significant. NBC News, "Meet the Press - February 21, 2021," 21 Feb. 2021 Narco-subs are semisubmersibles that float mostly below the waterline and have long ferried cocaine from Colombia to Central America. James Marson, WSJ, "Spanish Police Seize Submarine Built to Carry Drugs," 12 Mar. 2021 The explosions, which the ship’s owner speculated could have been caused by missiles or mines, left holes above the waterline on both sides of its hull. Washington Post, "Israel blames Iran for attack on freighter near the Persian Gulf," 1 Mar. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'waterline.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of waterline

circa 1625, in the meaning defined above

Keep scrolling for more

Learn More about waterline

Time Traveler for waterline

Time Traveler

The first known use of waterline was circa 1625

See more words from the same year

Statistics for waterline

Last Updated

25 Apr 2021

Cite this Entry

“Waterline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/waterline. Accessed 6 May. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for waterline



English Language Learners Definition of waterline

: the level that water reaches on the side of a ship
US : a horizontal mark on a wall or other surface that was made by water during a flood and that shows how high the water was


wa·​ter·​line | \ ˈwȯ-tər-ˌlīn How to pronounce waterline (audio) , ˈwä- \

Kids Definition of waterline

: any of several lines marked on the outside of a ship that match the surface of the water when the ship floats evenly

Comments on waterline

What made you want to look up waterline? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Star Wars Words Quiz

  • cu jedi training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
Name That Thing

Test your visual vocabulary with our 10-question challenge!


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!