: 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)
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“Epimer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/epimer. Accessed 3 Nov. 2025.
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epimer
noun
epi·mer
ˈep-i-mər 
: 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
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