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isomer noun
/ˈaɪ.sə.mər/
/-soʊ.mɚ/ n [C] 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 isomers
(Definition of isomer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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