/ Dictionary / Index D diachylon: Meaning and Definition of Find definitions for: di•ach•y•lon Pronunciation: (dī-ak'u-lon"), [key] — n. Med. an adhesive plaster consisting chiefly of litharge and oil, used in the treatment of wounds and excoriations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diachrony diacid Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language