epimer

American

[ep-uh-mer] / ˈɛp ə mər /

Also epimeride

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.

First recorded in 1910–15; epi- + -mer

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