Noun niagara river has 1 sense
  1. Niagara, Niagara River - a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York
    --1 is a kind of river
    --1 is a part of
     United States, United States of America, America, US, U.S., USA, U.S.A.; Canada
    --1 has parts: Niagara, Niagara Falls
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