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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 ?
A polarimeter was initially developed for the purpose of studying analogous enantiomers and gradually started gaining grounds for significant experiments across a multitude of industries, ranging from pharmaceuticals to food and beverages.
Clenbuterol is a racemic mixture of two enantiomers banned in sport since 1992.
The most likely first candidate is one of the enantiomers of ketamine, esketamine, which, because of higher binding affinity, can be dosed intranasally rather than intravenously.
Stereoregular complex formation with hydrogen bonding between PLLA and PDLA enantiomers is more favorable than single types of PLLA or PDLA.
Pyrethroids are chiral compounds characterized by geometric (cis and trans diastereomers) and optical isomerism (R and S enantiomers).
Ketoconazole or its enantiomers did not inhibit CYPs 19A1 or 21A2 at up to 1000 nanomolar concentration.
Stereoselective block of a human cardiac potassium channel (Kv1.5) by bupivacaine enantiomers. Biophysical Journal 1995;69(2):418-27.
Table 3: The ratio of binding affinity (Ki) of enantiomers of vesamicol analogs for VAChT, [[sigma].sub.1], and [[sigma].sub.2] receptors ((-)-body/(+)-body).
This can be accomplished by separating the enantiomers using a selective and sensitive method.
Our peak temperatures of the enantiomers (Table 3) are in reasonable agreement with the values reported by Olafsson and Bryan [10] (288[degrees]C), Weiss et al.
Their knowledge of the pharmaceutical sciences includes compositions and APIs, formulations (oral dosage forms, controlled release, ODTs, transdermal, topical, ophthalmic, transmucosal, parenteral, etc.), methods of use, polymorphs, enantiomers, drug delivery devices, and methods of manufacture.