/ Thesaurus / A Synonyms of alluvial fan Find synonyms for: Noun1. alluvial fan, alluvial cone, geological phenomenonusage: a fan-shaped deposit where a fast flowing stream flattens outWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acerbity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language