isomer

[ ahy-suh-mer ]
/ ˈaɪ sə mər /

noun

Chemistry. a compound displaying isomerism with one or more other compounds.
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. 2019

Examples from the Web for isomer

British Dictionary definitions for isomer

isomer

/ (ˈaɪsəmə) /

noun

chem a compound that exhibits isomerism with one or more other compounds
physics a nuclide that exhibits isomerism with one or more other nuclides

Derived Forms

isomeric (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

Medicine definitions for isomer

isomer

[ īsə-mər ]

n.

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.
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 forms

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

Science definitions for isomer

isomer

[ īsə-mər ]

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.
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.