niagara river Niagaran • Niall · · · Info · Definitions · Characters · · niagara river · · Text Common · · Latin · · Scripts 13 · · Length 6 · · Syllables Definitions · · · (noun) a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York. Synonyms: Niagara, Niagara River. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 e latin small letter e U+0065 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 v latin small letter v U+0076