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English definition of “isomer”

isomer

noun [C] uk   /ˈaɪ.sə.mər/ us    /-soʊ.mɚ/ specialized
any one of a group of chemical substances which all have the same number and type of atoms but in which the arrangement of the atoms is slightly different between each substance: structural/geometrical/optical isomersTypes of chemicalSpecific chemicals, chemical compounds and gasesSubstances and structures in the body
(Definition of isomer from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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