Isomer - Definitions from Dictionary.com

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Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This

i·so·mer

Audio Help [ahy-suh-mer] Pronunciation Key

–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

]

Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopædia Britannica, Inc.
Isomer

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American Heritage Dictionary - Cite This Source - Share This

i·so·mer Audio Help (ī'sə-mər) Pronunciation Key
n.

Chemistry 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.
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.

[Greek īsomerēs, having equal share : īso-, iso- + meros, part, share; see (s)mer-² in Indo-European roots.]

i'so·mer'ic (-měr'ĭk) adj., i'so·mer'i·cal·ly adv.

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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.

WordNet - Cite This Source - Share This

isomer
noun
a compound that exists in forms having different arrangements of atoms but the same molecular weight

The American Heritage Science Dictionary - Cite This Source - Share This

isomer Audio Help (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.