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