epi·​mer ˈe-pi-mər How to pronounce epimer (audio)
: either of two stereoisomers that differ in the arrangement of groups on a single asymmetric carbon atom (such as the first chiral center of a sugar's carbon chain)
epimeric adjective

Word History


epi- + isomer

First Known Use

circa 1911, in the meaning defined above

Time Traveler
The first known use of epimer was circa 1911

Dictionary Entries Near epimer

Cite this Entry

“Epimer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epimer. Accessed 2 Oct. 2023.

Medical Definition


epi·​mer ˈep-i-mər How to pronounce epimer (audio)
: either of the stereoisomers of a sugar or sugar derivative that differ in the arrangement of the hydrogen atom and the hydroxyl group on the first asymmetric carbon atom of a chain
epimeric adjective
Love words? Need even more definitions?

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