/ Dictionary / Index D digitoxin: Meaning and Definition of Find definitions for: dig•i•tox•in Pronunciation: (dij"i-tok'sin), [key] — n. Pharm. a white, crystalline, water-insoluble cardiac glycoside, CHO, or a mixture of cardiac glycosides of which this is the chief constituent, obtained from digitalis and used in the treatment of congestive heart failure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: digitoxin (Thesaurus) digitize diglossia Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language