Dictionary

isomer

noun iso·mer \ˈī-sə-mər\

Definition of ISOMER

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 of ISOMER

International Scientific Vocabulary, back-formation from isomeric
First Known Use: 1855
Medical Dictionary

isomer

noun iso·mer \ˈī-sə-mər\

Medical Definition of ISOMER

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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