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noun, Chemistry.
stereoisomerism in which the isomers are identical in molecular weight and most chemical and physical properties but differ in their effect on the rotation of polarized light.
isomerism of chemical compounds in which the two isomers differ only in that their molecules are mirror images of each other See also dextrorotation, laevorotatory, racemize

optical isomerism n.
Stereoisomerism involving the arrangement of substituents about an asymmetric carbon atom or atoms so that the various isomers differ in how they rotate a plane of polarized light.


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