/ Dictionary / Index S subdelirium: Meaning and Definition of Find definitions for: sub•de•lir•i•um Pronunciation: (sub"di-lēr'ē-um), [key] — pl. -lir•i•ums, -lir•i•a a mild delirium with lucid intervals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subdebutante subderivative Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language