reverse osmosis

noun

: the movement of fresh water through a semipermeable membrane when pressure is applied to a solution (such as seawater) on one side of it

Examples of reverse osmosis in a Sentence

Recent Examples on the Web
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Carbon—like reverse osmosis, which requires costly equipment—can indiscriminately strip out smaller molecules, removing color and flavor along with any suspect chemicals. Nicola Twilley, New Yorker, 5 Jan. 2026 As is, this water is undrinkable, but, primarily through a process of reverse osmosis, the salt and mineral content can be removed, and the water can be made safe to drink. Matthew Adams, Fort Worth Star-Telegram, 21 Oct. 2025 Another focus is upgrading its water production systems with a reverse osmosis plant that produces safe drinking water from seawater, allowing the number of scientists to be stationed at the base to increase. New Atlas, 24 Sep. 2025 The AquaTru Classic is a highly effective countertop reverse osmosis system with a four-stage filtration process that removes up to 99 percent of more than 80 contaminants, including lead, fluoride and PFAS. Nora Colomer, FOXNews.com, 6 Sep. 2025 See All Example Sentences for reverse osmosis

Word History

First Known Use

1921, in the meaning defined above

Time Traveler
The first known use of reverse osmosis was in 1921

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Cite this Entry

“Reverse osmosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/reverse%20osmosis. Accessed 10 Jan. 2026.

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