/ Dictionary / Index D desiderium: Meaning and Definition of Find definitions for: des•i•de•ri•um Pronunciation: (des"i-dēr'ē-um), [key] — pl. -de•ri•a an ardent longing, as for something lost. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. desideratum design Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language