estuary

noun

es·​tu·​ary ˈes-chə-ˌwer-ē How to pronounce estuary (audio)
ˈesh-
plural estuaries
: a water passage where the tide meets a river current
especially : an arm of the sea at the lower end of a river

Did you know?

A partly enclosed coastal body of water in which river water is mixed with seawater is called an estuary. An estuary is thus defined by salinity rather than geography. Many coastal features designated by other names are in fact estuaries (for instance, Chesapeake Bay). Some of the oldest continuous civilizations have flourished in estuarine environments (for example, the Tigris and Euphrates rivers, the Nile delta, and the Ganges delta). Cities such as London (Thames River), New York (Hudson River), and Montreal (St. Lawrence River) developed on estuaries and became important commercial centers.

Examples of estuary in a Sentence

the city sits on the shores of a deep estuary where the Hudson River meets the Atlantic Ocean
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.
Day visitors and overnight guests can utilize a variety of rental options to explore the quiet wetlands of the Colorado River estuary. Mariah Tyler, Travel + Leisure, 8 Mar. 2025 Stuart’s home county, Martin County, sits on the most biodiverse estuary in the Northern Hemisphere and is home to 100 artificial reef systems and more than 800 species of fish. Tara Massouleh McCay, Southern Living, 7 Mar. 2025 Climate change and variability drive increasing exposure of marine heatwaves across US estuaries. William Lambers, Newsweek, 7 Mar. 2025 Sometime this coming year, the state water board will vote to either require more water to flow through the beleaguered estuary or permit water users to voluntarily restore habitat for fish. Ari Plachta, Sacramento Bee, 28 Feb. 2025 See All Example Sentences for estuary

Word History

Etymology

Latin aestuarium, from aestus boiling, tide; akin to Latin aestas summer — more at edify

First Known Use

1538, in the meaning defined above

Time Traveler
The first known use of estuary was in 1538

Browse Nearby Words

Cite this Entry

“Estuary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/estuary. Accessed 21 Apr. 2025.

Kids Definition

estuary

noun
es·​tu·​ary ˈes-chə-ˌwer-ē How to pronounce estuary (audio)
plural estuaries
: a passage where the tide meets a river current
especially : an arm of the sea at the lower end of a river
estuarine
ˈes-chə-wə-ˌrīn
adjective

More from Merriam-Webster on estuary

Last Updated: - Updated example sentences
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