alluvial plain alluvial flat • alluvial sediment · · · Info · Definitions · Synonyms · Characters · · alluvial plain · · Text Common · · Latin · · Scripts 14 · · Length 4 · · Syllables Definitions · · · (noun) a flat resulting from repeated deposits of alluvial material by running water. Synonyms: alluvial flat, alluvial plain. · · Noun Definition 1 Synonyms · · · alluvial flat · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 i latin small letter i U+0069 l latin small letter l U+006C n latin small letter n U+006E p latin small letter p U+0070 u latin small letter u U+0075 v latin small letter v U+0076