/ Dictionary / Index D diester: Meaning and Definition of Find definitions for: di•es•ter Pronunciation: (dī'es"tur), [key] — n. Chem. an organic compound that contains two ester groups. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dies non diestock Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language