isomer
noun
iso·mer ˈī-sə-mər 
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
Example Sentences
Recent Examples on the Web 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 Delta 8 is considered an isomer of Delta 9 THC, the main psychoactive ingredient in marijuana. Jay R. Jordan, Chron, 8 Nov. 2021 Delta-8 has been reported to be less active than delta-9; however, it has not been studied as much as the delta-9 isomer. Dr. Keith Roach, oregonlive, 5 Nov. 2021 It's considered an isomer of Delta 9 THC, the main psychoactive ingredient in marijuana. Jay R. Jordan, Chron, 26 Oct. 2021 See More
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 Delta 8 is considered an isomer of Delta 9 THC, the main psychoactive ingredient in marijuana. Jay R. Jordan, Chron, 8 Nov. 2021 Delta-8 has been reported to be less active than delta-9; however, it has not been studied as much as the delta-9 isomer. Dr. Keith Roach, oregonlive, 5 Nov. 2021 It's considered an isomer of Delta 9 THC, the main psychoactive ingredient in marijuana. Jay R. Jordan, Chron, 26 Oct. 2021 See More Word History
Etymology
International Scientific Vocabulary, back-formation from isomeric
First Known Use
1855, in the meaning defined at sense 1
Phrases Containing isomer
Medical Definition
isomer
noun
iso·mer ˈī-sə-mər
1
: any 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