: the ion in an electrolyzed solution that migrates to the anode
broadly
: a negatively charged ion
Examples of anion in a Sentence
Recent Examples on the Web
This avoids a problem with direct conversion of CO2 to acetate: CO2 is an acidic gas, while acetate—as an anion—is basic.
—
Tom Hawking, Popular Science, 23 Oct. 2024
These are all meant to conduct metals, isotopic elemental, and anion analyses while determining physical and chemical properties.
—Tim Newcomb, Popular Mechanics, 10 Dec. 2019
The former converts to H2, and the latter travels through the membrane, known as an anion exchange membrane (AEM).
—Robert F. Service, Science | AAAS, 10 Mar. 2020
Being an anion, meanwhile, means that the sulfidic molecules have negative charges.
—David Grossman, Popular Mechanics, 9 Apr. 2018
These carbon chain anions are akin to Legos that can be pieced together into larger molecules, reports Meghan Bartels for Mic.
—Ben Panko, Smithsonian, 31 July 2017
This molecule, called a carbon chain anion, appears to be a catalyst for complicated chemical reactions, said lead author Ravi Desai.
—OrlandoSentinel.com, 9 Aug. 2017
These carbon chain anions are akin to Legos that can be pieced together into larger molecules, reports Meghan Bartels for Mic.
—Ben Panko, Smithsonian, 28 July 2017
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Tom Hawking, Popular Science, 23 Oct. 2024
These are all meant to conduct metals, isotopic elemental, and anion analyses while determining physical and chemical properties.
—Tim Newcomb, Popular Mechanics, 10 Dec. 2019
The former converts to H2, and the latter travels through the membrane, known as an anion exchange membrane (AEM).
—Robert F. Service, Science | AAAS, 10 Mar. 2020
Being an anion, meanwhile, means that the sulfidic molecules have negative charges.
—David Grossman, Popular Mechanics, 9 Apr. 2018
These carbon chain anions are akin to Legos that can be pieced together into larger molecules, reports Meghan Bartels for Mic.
—Ben Panko, Smithsonian, 31 July 2017
This molecule, called a carbon chain anion, appears to be a catalyst for complicated chemical reactions, said lead author Ravi Desai.
—OrlandoSentinel.com, 9 Aug. 2017
These carbon chain anions are akin to Legos that can be pieced together into larger molecules, reports Meghan Bartels for Mic.
—Ben Panko, Smithsonian, 28 July 2017
Cite this Entry
“Anion.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/anion. Accessed 9 Jul. 2025.
Copy CitationKids Definition
anion
noun
an·ion
ˈan-ˌī-ən 
: a negatively charged ion
Medical Definition
anion
noun
an·ion
ˈan-ˌī-ən
: the ion in an electrolyzed solution that migrates to the anode
broadly
: a negatively charged ion
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