en·​an·​tio·​mer | \ i-ˈnan-tē-ə-mər How to pronounce enantiomer (audio) \

Definition of enantiomer

: either of a pair of chemical compounds whose molecular structures have a nonsuperimposable mirror-image relationship to each other — compare diastereomer

Keep scrolling for more

Other Words from enantiomer

enantiomeric \ i-​ˌnan-​tē-​ə-​ˈmer-​ik How to pronounce enantiomer (audio) \ adjective

Examples of enantiomer in a Sentence

Recent Examples on the Web And then there’s the case of esketamine, which is the S-enantiomer of ketamine, a similar (in molecular structure) but more potent agent than ketamine. Joshua Cohen, Forbes, 5 July 2021 Ketamine is a combination of two enantiomers, or mirror image molecules. Megan Thielking, Scientific American, 6 Mar. 2019 Strangely enough, meth's enantiomer is the active ingredient in Vick's Vapor Inhaler. William Herkewitz, Popular Mechanics, 19 Aug. 2013

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'enantiomer.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of enantiomer

circa 1929, in the meaning defined above

History and Etymology for enantiomer

Greek enantios + English -mer

Keep scrolling for more

Learn More About enantiomer

Time Traveler for enantiomer

Time Traveler

The first known use of enantiomer was circa 1929

See more words from the same year

Dictionary Entries Near enantiomer




See More Nearby Entries 

Statistics for enantiomer

Cite this Entry

“Enantiomer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/enantiomer. Accessed 24 Oct. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon
Seen & Heard
People are talking about

Keep scrolling for more

More Definitions for enantiomer


en·​an·​tio·​mer | \ in-ˈant-ē-ə-mər How to pronounce enantiomer (audio) \

Medical Definition of enantiomer

: either of a pair of chemical compounds whose molecular structures have a mirror-image relationship to each other

called also optical antipode

Other Words from enantiomer

enantiomeric \ -​ˌant-​ē-​ə-​ˈmer-​ik How to pronounce enantiomer (audio) \ adjective
enantiomerically \ -​i-​k(ə-​)lē How to pronounce enantiomer (audio) \ adverb

More from Merriam-Webster on enantiomer

Britannica.com: Encyclopedia article about enantiomer


Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
True or False

Test your knowledge - and maybe learn something along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!