Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun 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.
  • noun 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.

from The Century Dictionary.

  • noun In chem., a compound that exhibits the properties of isomerism with reference to some other compound. Also isomeride.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Chem.) A compound which is isomeric with another body or compound; a compound having the same chemical composition as another compound; a member of an isomeric series.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun chemistry Any of two or more compounds with the same molecular formula but with different structure.
  • noun physics Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

iso- + -mer

Examples

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