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
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
This allows the molecule to turn into an energy-rich isomer.
—Joshua Hawkins, BGR, 15 Apr. 2022
That isomer acts as a liquid solar energy storage solution.
—Joshua Hawkins, BGR, 15 Apr. 2022
THCs are psychoactive, and the term THC generally refers to the delta-9 isomer, but several others, including delta-8, may also be found naturally in plants, in small amounts.
—Dr. Keith Roach, oregonlive, 5 Nov. 2021
His companies do not sell Delta-8 products because Faude has not seen enough research on possible negative effects of the isomer.
—Jordyn Noennig, Milwaukee Journal Sentinel, 5 Jan. 2022
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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
This allows the molecule to turn into an energy-rich isomer.
—Joshua Hawkins, BGR, 15 Apr. 2022
That isomer acts as a liquid solar energy storage solution.
—Joshua Hawkins, BGR, 15 Apr. 2022
THCs are psychoactive, and the term THC generally refers to the delta-9 isomer, but several others, including delta-8, may also be found naturally in plants, in small amounts.
—Dr. Keith Roach, oregonlive, 5 Nov. 2021
His companies do not sell Delta-8 products because Faude has not seen enough research on possible negative effects of the isomer.
—Jordyn Noennig, Milwaukee Journal Sentinel, 5 Jan. 2022
See More
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'isomer.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
Etymology
International Scientific Vocabulary, back-formation from isomeric
First Known Use
1855, in the meaning defined at sense 1
Phrases Containing isomer
Dictionary Entries Near isomer
Cite this Entry
“Isomer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isomer. Accessed 26 Sep. 2023.
Copy Citation
Kids 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
More from Merriam-Webster on isomer
Britannica.com: Encyclopedia article about isomer
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