noun Chemistry.
either of a pair of isomeric aldose compounds, especially of certain sugars, that differ from each other in the positions of the H and OH at the second atom from the end of the carbon chain, as d-glucose and d-mannose.
Also, epimeride [uh-pim-uh-rahyd] .

1910–15; epi- + -mer

epimeric [ep-uh-mer-ik] , adjective
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World English Dictionary
epimerism (ɪˈpɪməˌrɪzəm)
optical isomerism in which isomers (epimers) can form about asymmetric atoms within the molecule, esp in carbohydrates
[C20: German Epimer (see epi-, -mer) + -ism]

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Medical Dictionary

epimer ep·i·mer (ěp'ə-mər)
One of two molecules that differ only in the spatial arrangement around a single carbon atom.

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