isomer
Americannoun
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Chemistry. a compound displaying isomerism with one or more other compounds.
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Also called nuclear isomer. Physics. a nuclide that exhibits isomerism with one or more other nuclides.
noun
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chem a compound that exhibits isomerism with one or more other compounds
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physics a nuclide that exhibits isomerism with one or more other nuclides
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Chemistry Any of two or more substances that have the same molecular formula but differ in their connectivity or spatial arrangement of atoms, or in their topology in macromolecules.
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Physics Any of two or more nuclei with the same mass number and atomic number that have different radioactive properties and can exist in any of several energy states for a measurable period of time.
Other Word Forms
- isomeric adjective
Etymology
Origin of isomer
First recorded in 1865–70; back formation from isomeric
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Vocabulary lists containing isomer
Chemistry - High School
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Organic Chemistry
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Nuclear Processes
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In the fifth step, an isomerase transforms the dihydroxyacetone-phosphate into its isomer, glyceraldehyde-3-phosphate.
From Textbooks • Jun. 9, 2022
In one isomer, cis chloride ligands cause more electron density on one side of the molecule than on the other, making it polar.
From Textbooks • Feb. 14, 2019
The compound 2-butene and some other alkenes also form a second type of isomer called a geometric isomer.
From Textbooks • Feb. 14, 2019
Only one isomer will fit into opioid receptors in cells.
From Nature • May 16, 2017
You don't have the foggiest notion of what an optical isomer is and you know it.
From A Feast of Demons by Samachson, Joseph
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
