One of two molecules (having more than one chiral center) differing only in the spatial arrangement about a single chiral atom; e.g., α-d-glucose and α-d-galactose (with respect to carbon-4). See sugars. Cf.:anomer. [epi- + G. meros, part]
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epi·mer 'ep-i-mər n 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
epi·mer·ic .ep-i-'mer-ik adj
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ep·i·mer (epґĭ-mər) either of two diastereomers that differ in the configuration around one asymmetric carbon atom.Medical dictionary. 2011.