Etymology
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Niagara

waterfall from Lake Erie to Lake Ontario, from a town name, perhaps from an Iroquoian language and meaning "a neck" (between two bodies of water); general sense of "a cataract, torrent" is attested from 1841; meaning " 'shower' of ringlets (true or false) in women's hair" is from 1864, also known as cataract curls.

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Definitions of Niagara

Niagara (n.)
waterfall in Canada is the Horseshoe Falls; in the United States it is the American Falls;
Synonyms: Niagara Falls
Niagara (n.)
a river flowing from Lake Erie into Lake Ontario; forms boundary between Ontario and New York;
Synonyms: Niagara River
From wordnet.princeton.edu