/ Dictionary / Index D diethyl ether: Meaning and Definition of Find definitions for: di•eth'yl e'ther Pronunciation: (dī-eth'ul), [key] — Chem. Chem. ether (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diethylene glycol diethyl oxide Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language