sea·​wa·​ter ˈsē-ˌwȯ-tər How to pronounce seawater (audio)
: water in or from the sea

Examples of seawater in a Sentence

Recent Examples on the Web The modern sharks share some key attributes with O. megalodon, such as body temperatures elevated above the surrounding seawater and preferences for fat-rich prey to help fuel their active lifestyles. Riley Black, Smithsonian Magazine, 21 Jan. 2024 Trawling is adding still more CO2 to seawater, and with it more acidity. Matt Simon, WIRED, 18 Jan. 2024 Others have raised concerns that the seawater could destroy Gaza’s land, exacerbating a humanitarian crisis in the Palestinian enclave where food and water are in short supply and health officials say more than 17,000 people have been killed by weeks of Israeli attacks. Peter Alexander, NBC News, 7 Dec. 2023 The current also divides the seawater into basic and acidic streams. Popular Science, 29 Nov. 2023 That’s the issue that must be resolved by reallocating existing supplies, building new storage and/or creating new supplies, such as desalination of seawater. Dan Walters, The Mercury News, 30 Jan. 2024 When fire-ice melts, the methane dissociates and dissolves into the seawater or bubbles up to the water's surface. Devika Rao, theweek, 1 Jan. 2024 The historically high waves that slammed into San Diego County and much of California over the New Year’s weekend gave way to more seasonable surf Tuesday, but not before the surge of seawater further damaged the Ocean Beach Pier. Jeff McDonald, San Diego Union-Tribune, 2 Jan. 2024 Reverse osmosis leaves behind a salty brine that can be released back into the ocean after being mixed with seawater. IEEE Spectrum, 21 Dec. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'seawater.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

before the 12th century, in the meaning defined above

Time Traveler
The first known use of seawater was before the 12th century

Dictionary Entries Near seawater

Cite this Entry

“Seawater.” Dictionary, Merriam-Webster, Accessed 24 Feb. 2024.

Kids Definition


sea·​wa·​ter ˈsē-ˌwȯt-ər How to pronounce seawater (audio)
: water in or from the sea

More from Merriam-Webster on seawater

Last Updated: - Updated example sentences
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