Dictionary
3 ENTRIES FOUND:

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

Origin of ISOMER

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

isomer

noun iso·mer \ˈī-sə-mər\   (Medical Dictionary)

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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