/ Thesaurus / A Synonyms of alluvial soil Find synonyms for: Noun1. alluvial soil, soil, dirtusage: a fine-grained fertile soil deposited by water flowing over flood plains or in river bedsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language