from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Isomerism created by differences in the spatial arrangement of atoms in a molecule.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry A form of
isomerismin which atomsare arranged differentlyabout a chiral centre(or centre of asymmetry); they exhibit optical activity; in a moleculewith a singlechiral centre the two isomers ( enantiomers) are mirror imagesof each other; in a molecule with multiplechiral centres the isomers ( diastereoisomers) are not normally mirror images.
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