/ Dictionary / Index D diluvial: Meaning and Definition of Find definitions for: di•lu•vi•al Pronunciation: (di-l'vē-ul), [key] — adj. pertaining to or caused by a flood or deluge. pertaining to or consisting of diluvium. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diluvial (Thesaurus) dilution diluvium Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language