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Either of a pair of molecules that are mirror images but cannot be superimposed on each other, and that rotate the plane of polarized light by an equal amount in opposite directions. Also called enantiomorph, optical isomer.

[Greek enantios, opposite; see ant- in Indo-European roots + -mer, isomer.]

en·an′ti·o·mer′ic (-mĕr′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Chemistry) chem a molecule that exhibits stereoisomerism because of the presence of one or more chiral centres
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪˈnæn ti ə mər)

either of a pair of optical isomers that are mirror images of each other.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.enantiomer - either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical
chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
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References in periodicals archive ?
In particular, these latter properties, specific of l-enantiomer, are attributed to direct stimulation of endothelial-dependent NO release with a consequent increase of NO bioavailability (17).
In their work, using these functional AAILs as acceptor phase and ethyl acetate as donor phase, more l-enantiomer of amino acid was extracted into the ionic-liquid phase than that of d-enantiomer [16].
The L-enantiomer of o,p'-DDT was the most efficacious compound at [10.sup.-5] M, even more than [E.sub.2] at [10.sup.-8] M (124% of [E.sub.2] effect), indicating that it is a full agonist of hER-mediated transactivation.