flood plain floodplain • floodproof · · · Info · Definitions · Synonyms · Characters · · flood plain · · Text Common · · Latin · · Scripts 11 · · Length 2 · · Syllables Definitions · · · (noun) a low plain adjacent to a river that is formed chiefly of river sediment and is subject to flooding. Synonyms: floodplain, flood plain. · · Noun Definition 1 Synonyms · · · floodplain · · Synonym 1 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 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 o latin small letter o U+006F p latin small letter p U+0070