/ Dictionary / Index D diluvium: Meaning and Definition of Find definitions for: di•lu•vi•um Pronunciation: (di-l'vē-um), [key] — pl. -vi•a -vi•ums. a coarse surficial deposit formerly attributed to a general deluge but now regarded as glacial drift. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diluvial dim Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language