/ Dictionary / Index A alluvial: Meaning and Definition of Find definitions for: al•lu•vi•al Pronunciation: (u-l'vē-ul), [key] — adj. of or pertaining to alluvium. —n. alluvial soil. gold-bearing alluvial soil. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: alluvial (Thesaurus) allusive alluvial fan Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language