/ Dictionary / Index D diastereomer: Meaning and Definition of Find definitions for: di•a•ster•e•o•mer Pronunciation: (dī"u-ster'ē u mur, -stēr'-), [key] — n. Chem. either of a pair of stereoisomers that are not mirror images of each other. Also calledCf. enantiomer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diaster diastole Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language