Definition of "enantiomer" [e•nan•ti•o•mer]

• See enantiomorph. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "When switching dosage forms, if the prescriber does not obtain the desired therapeutic endpoint in spite of education about the extensive differences in inhalers, there are alternatives - use of a spacer, increased dose causing more side effects or switching to Xopenex, the R- enantiomer which is the active portion of the racemic albuterol."
• "Nexium is only the S-enantiomer; Prilosec is a racemic mixture."
• "In the context of any electrical field capable of orienting highly polar sugar derivatives, you'd have both selection of ribose, as it binds more closely to the surface, and of one particular enantiomer of ribose."