/ Dictionary / Index D dithionic: Meaning and Definition of Find definitions for: di•thi•on•ic Pronunciation: (dī"thī-on'ik, dith"ē-), [key] — adj. Chem. of or derived from dithionic acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dithionate dithionic acid Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language