
diastereomeric. Compare with enantiomer. Stereoisomers which are not mirror images of each other. Diastereomers are chemically similar but distinguishable; they have different melting points and boiling points and they react at different rates.
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http://antoine.frostburg.edu/chem/senese/101/glossary/d.shtml

Diastereomers (sometimes called diastereoisomers) are stereoisomers that are not enantiomers. Diastereomerism occurs when two or more stereoisomers of a compound have different configurations at one or more (but not all) of the equivalent (related) stereocenters and are not mirror images of each other. When two diastereoisomers differ from each ot...
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http://en.wikipedia.org/wiki/Diastereomer

either of a pair of stereoisomers that are not mirror images of each other. Also calledCf. enantiomer.
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https://www.infoplease.com/dictionary/diastereomer
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