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Isomer definition

īsə-mər
isomers
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(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.
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(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.
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(chem.) Any of two or more chemical compounds having the same constituent elements in the same proportion by weight but differing in physical or chemical properties because of differences in the structure of their molecules.
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(physics) Any of two or more nuclei possessing the same number of neutrons and protons, but existing in different energy states, and thus having different radioactive properties.
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(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.
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(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.
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(chemistry) Any of two or more compounds with the same molecular formula but with different structure.
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(physics) Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.
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Other Word Forms

Noun

Singular:
isomer
Plural:
isomers

Origin of isomer

  • Greek īsomerēs having equal share īso- iso- meros part, share (s)mer-2 in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • iso- +‎ -mer

    From Wiktionary

Isomer Sentence Examples

  • An isomer of cinnamic acid known as allo-cinnamic acid is also known.

  • Consequently, of each pair of isomers we may establish beforehand which is the more stable; either in particular circumstances, a direct change taking place, as, for instance, with maleic acid, which when exposed to sunlight in presence of a trace of bromine, yields the isomeric fumaric acid almost at once, or, indirectly, one may conclude that the isomer which forms under greater heat-development is the more stable, at least at lower temperatures.

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