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isomer

[ahy-suh-mer]
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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 of isomer

First recorded in 1865–70; back formation from isomeric
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for isomer

isomer

noun
  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
Derived Formsisomeric (ˌaɪsəˈmɛrɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for isomer

n.

1866, back-formation from isomeric; cf. Greek isomeres "sharing equality," from iso- (see iso-) + meros "part, share" (see merit (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper

isomer in Medicine

isomer

([object Object])
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.
Related formsi′so•meric (-mĕrĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

isomer in Science

isomer

sə-mər]
  1. 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.
  2. 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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