heavy water

noun

1
: the compound D2O composed of deuterium and oxygen

called also deuterium oxide

2
: water enriched in deuterium

Examples of heavy water in a Sentence

Recent Examples on the Web Explore our new section Opponents say the tunnel is a boondoggle that would further imperil the delta’s fragile ecosystem, which has already been eroded by heavy water withdrawals for agriculture and cities. Hayley Smith, Los Angeles Times, 29 Feb. 2024 Additionally, the sanctions waiver also applies to the export of enriched uranium and heavy water outside of Iran which was needed to keep Iran within its stockpile limits under the 2015 nuclear deal, intended to stop Iran from gaining the capacity to produce a nuclear weapon. William Mauldin, WSJ, 4 Feb. 2022 So over millions of years, this process of water formation tends to concentrate deuterium in heavy water. The Physics Arxiv Blog, Discover Magazine, 20 Dec. 2022 But because deuterium is heavier than hydrogen, heavy water is less likely to dissociate. The Physics Arxiv Blog, Discover Magazine, 20 Dec. 2022 Instead, the samples weighed in with about 25 percent less heavy water compared with normal water — far less than expected. Nola Taylor Redd, Discover Magazine, 1 Nov. 2019

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Word History

First Known Use

1933, in the meaning defined at sense 1

Time Traveler
The first known use of heavy water was in 1933

Dictionary Entries Near heavy water

Cite this Entry

“Heavy water.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/heavy%20water. Accessed 24 Apr. 2024.

Kids Definition

heavy water

noun
: water enriched in deuterium

Medical Definition

heavy water

noun
1
: the compound D2O composed of deuterium and oxygen

called also deuterium oxide

2
: water having a higher-than-usual proportion of deuterium among its hydrogen atoms

More from Merriam-Webster on heavy water

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