isomer

noun iso·mer \ ˈī-sə-mər \
1 : one of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties
2 : a nuclide isomeric with one or more others

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Origin and Etymology of isomer

International Scientific Vocabulary, back-formation from isomeric

Medical Dictionary

isomer

noun iso·mer \ ˈī-sə-mər \
1 : any of two or more compounds, radicals, or ions that contain the same number of atoms of the same elements but differ in structural arrangement and properties
2 : a nuclide isomeric with one or more others

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