isomer

[ahy-suh-mer]
noun
1.
Chemistry. a compound displaying isomerism with one or more other compounds.
2.
Also called nuclear isomer. Physics. a nuclide that exhibits isomerism with one or more other nuclides.

Origin:
1865–70; back formation from isomeric

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World English Dictionary
isomer (ˈaɪsəmə)
 
n
1.  chem a compound that exhibits isomerism with one or more other compounds
2.  physics a nuclide that exhibits isomerism with one or more other nuclides
 
isomeric
 
adj

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American Heritage
Medical Dictionary

isomer i·so·mer (ī'sə-mər)
n.

  1. Any of two or more substances that are composed of the same elements in the same proportions but differ in properties because of differences in the arrangement of atoms.

  2. 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.


i'so·mer'ic (-měr'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
isomer   (ī'sə-mər)  Pronunciation Key 
Any of two or more compounds, such as lactose and sucrose, composed of the same elements in the same proportions but differing in structure and other properties. There are two types of isomers, structural isomers and stereoisomers.
The American Heritage® Science Dictionary
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American Heritage
Cultural Dictionary
isomers [(eye-suh-muhrz)]

In chemistry, molecules that contain exactly the same numbers of the same kinds of atoms, but in which the atoms have different structural arrangements.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
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Example sentences
Compounds with the same composition but different arrangements are called isomers.
One possible source being explored is nuclear isomers.
These are frequently termed geometric isomers, in contrast to the previous that are typically termed structural isomers.
Cis isomers and trans isomers often have different physical properties.
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