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isomer

noun [C]
 
 
/ˈaɪ.sə.mər/ US  /-soʊ.mɚ/ specialized

Definition

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 noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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