- 1(chemistry) one of two or more compounds that have the same atoms, but in different arrangements
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- 2(physics) one of two or more nuclei that have the same atomic number, but different energy states
NAmE//ˌaɪsəˈmɛrɪk//
adjective NAmE//aɪˈsɑməˌrɪzəm//
noun [uncountable]See isomer in the Oxford Advanced Learner's DictionaryCheck pronunciation: isomer