ultrapure

adjective

ul·​tra·​pure ˌəl-trə-ˈpyu̇r How to pronounce ultrapure (audio)
: extremely pure
ultrapure metals/crystals
especially : extremely clean and free from contaminants such as dirt or bacteria
ultrapure water

Examples of ultrapure in a Sentence

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.
Silicon Wafers The ultrapure silicon is made up of many crystals at different orientations. IEEE Spectrum, 22 Sep. 2025 Low-iron glass is made from ultrapure sand that is low in iron oxide. Aki Ishida, The Conversation, 10 Sep. 2025 Researchers first treated and sterilized thin sections of fossil using a mixture of ultrapure water and ethanol. Andrew Paul, Popular Science, 6 Feb. 2025 The famed Super-Kamiokande detector in Japan, which detected all of 12 neutrinos from a distant supernova in 1987, uses 50,000 metric tons of ultrapure water to catch a glimpse of the occasional neutrino interaction. Paul Sutter, Ars Technica, 11 June 2024 That process requires expensive tools, such as lithography machines, and ultrapure water filtration. Dylan Sloan, Fortune, 10 Apr. 2024

Word History

First Known Use

1818, in the meaning defined above

Time Traveler
The first known use of ultrapure was in 1818

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Cite this Entry

“Ultrapure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ultrapure. Accessed 11 Oct. 2025.

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