alluvial fan alluvial deposit • alluvial flat · · · Info · Definitions · Synonyms · Characters · · alluvial fan · · Text Common · · Latin · · Scripts 12 · · Length 4 · · Syllables Definitions · · · (noun) a fan-shaped deposit where a fast flowing stream flattens out. Synonyms: alluvial fan, alluvial cone. · · Noun Definition 1 Synonyms · · · alluvial cone · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 f latin small letter f U+0066 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E u latin small letter u U+0075 v latin small letter v U+0076