/ Dictionary / Index D diacid: Meaning and Definition of Find definitions for: di•ac•id Pronunciation: (dī-as'id), [key] — adj. Chem. capable of combining with two molecules of a monobasic acid. (of an acid or a salt) having two replaceable hydrogen atoms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diachylon diaconal 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