/ Dictionary / Index I illuvium: Meaning and Definition of Find definitions for: il•lu•vi•um Pronunciation: (i-l'vē-um), [key] — pl. -vi•ums, -vi•a the material accumulated through illuviation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. illuviation ill will Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language