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Definition of isomer noun from the Oxford Advanced American Dictionary

     

    isomer

     noun
    noun
    NAmE//ˈaɪsəmər//
     
     
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  1. 1(chemistry) one of two or more compounds that have the same atoms, but in different arrangements
  2. 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 the Oxford Advanced Learner's Dictionary entry: isomer