/ Dictionary / Index D deliriant: Meaning and Definition of Find definitions for: de•lir•i•ant Pronunciation: (di-lēr'ē-unt), [key] — adj. involving or causing delirium. —n. a substance, as a compound or drug, that causes delirium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. deliration delirious Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language