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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
To spot neutrinos colliding with atoms in the atmosphere, experiments have buried 1,000 tons of heavy water, woven cameras through a cubic kilometer of Antarctic ice, and planned to deploy 200,000 antennas.
—Matt Von Hippel, Ars Technica, 25 Nov. 2024
Notwithstanding its affirmations of Iranian compliance, the IAEA has acknowledged that Iran violated the JCPOA twice by exceeding its limit on heavy water, a key material for the production of a plutonium bomb.
—Tzvi Kahn, Foreign Affairs, 16 Feb. 2017
This geometric frustration is even worse in ices made of heavy water, whose hydrogen atoms have a neutron as well as a proton—a problem for scientists who use heavy ices in experiments to reveal ice crystals’ precise structures.
—Elise Cutts, Scientific American, 19 Mar. 2024
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
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Word History
First Known Use
1933, in the meaning defined at sense 1
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 Dec. 2024.
Kids Definition
heavy water
noun
: water enriched in deuterium
Medical Definition
heavy water
noun1
: 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
Britannica.com: Encyclopedia article about heavy water
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