Isomer definitions

ī'sə-mər
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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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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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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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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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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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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Origin of isomer

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

Sentence Examples

  • MANDELIC ACID (Phenylglycollic Acid), C 8 H 8 O 3 or C 6 H 5 CH(OH) COOH, an isomer of the cresotinic and the oxymethylbenzoic acids.

  • According to the above formula the critical temperature is given by 8aA/54b, and as the critical temperature is approximately proportional to the boiling-point, both being estimated on the absolute scale of temperature, we may conclude that the larger value of b corresponds to the lower boilingpoint, and indeed the isomer corresponding to the left-hand formula boils at 74°, the other at 114°.

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

  • Phenazone is an isomer of phenazine, to which it bears the same relation that phenanthrene bears to anthracene.

  • 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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Words near isomer in the Dictionary