1
: one of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties
2
: a nuclide isomeric with one or more others
Examples of isomer in a Sentence
Recent Examples on the Web
Certainly, by the time that pair had been folded into the crew, Cargill seemed like Owsley’s counterpart — an isomer, in chemical terms.
—
John Semley, Rolling Stone, 19 Apr. 2025
This is possible since both Delta 8 is technically an isomer of CBD.
—Amber Smith, Discover Magazine, 3 Apr. 2024
The resulting compound includes non-natural THC isomers generated during the hydrogenation process.
—Dario Sabaghi, Forbes, 20 Feb. 2024
Advertisement In 2019, the Food and Drug Administration approved a version of ketamine (ketamine is made up of two isomers, or molecules, that can be split apart) called esketamine, for treatment of depression.
—Anita Chabria, Los Angeles Times, 22 Dec. 2023
In the wake of that move some in the cannabis industry began experimenting with ways to extract THC isomers from cannabidiol (CBD), a non-intoxicating compound which is found in abundance in hemp.
—Dale Ellis, Arkansas Online, 21 Aug. 2023
These restrictions aim to prevent minors from accessing or using substances that contain THC isomers.
—Amber Smith, Discover Magazine, 14 July 2023
Like Delta 9 THC, Delta 8 produces many of the same effects as its isomer.
—Amber Smith, Discover Magazine, 20 Sep. 2022
For example, technetium-99m is an isomer of technetium-99.
—Artemis Spyrou, The Conversation, 24 May 2022
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John Semley, Rolling Stone, 19 Apr. 2025
This is possible since both Delta 8 is technically an isomer of CBD.
—Amber Smith, Discover Magazine, 3 Apr. 2024
The resulting compound includes non-natural THC isomers generated during the hydrogenation process.
—Dario Sabaghi, Forbes, 20 Feb. 2024
Advertisement In 2019, the Food and Drug Administration approved a version of ketamine (ketamine is made up of two isomers, or molecules, that can be split apart) called esketamine, for treatment of depression.
—Anita Chabria, Los Angeles Times, 22 Dec. 2023
In the wake of that move some in the cannabis industry began experimenting with ways to extract THC isomers from cannabidiol (CBD), a non-intoxicating compound which is found in abundance in hemp.
—Dale Ellis, Arkansas Online, 21 Aug. 2023
These restrictions aim to prevent minors from accessing or using substances that contain THC isomers.
—Amber Smith, Discover Magazine, 14 July 2023
Like Delta 9 THC, Delta 8 produces many of the same effects as its isomer.
—Amber Smith, Discover Magazine, 20 Sep. 2022
For example, technetium-99m is an isomer of technetium-99.
—Artemis Spyrou, The Conversation, 24 May 2022
Cite this Entry
“Isomer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isomer. Accessed 30 Jun. 2025.
Copy CitationKids Definition
isomer
noun
iso·mer
ˈī-sə-mər 
: one of two or more chemical compounds or groups that have the same numbers of atoms of the same elements but differ in structure
isomeric
adjective
ˌī-sə-ˈmer-ik
isomerism
noun
ī-ˈsäm-ə-ˌriz-əm
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