Niagara Falls

noun
1.
the falls of the Niagara River: in Canada, the Horseshoe Falls, 158 feet (48 meters) high; 2600 feet (792 meters) wide; in the U.S., American Falls, 167 feet (51 meters) high; 1000 feet (305 meters) wide.
2.
a city in W New York, on the U.S. side of the falls.
3.
a city in SE Ontario, on the Canadian side of the falls.
British Dictionary definitions for Niagara Falls

Niagara Falls

noun
1.
(functioning as pl) the falls of the Niagara River, on the border between the US and Canada between Lake Erie and Lake Ontario: divided by Goat Island into the American Falls, 50 m (167 ft) high and approximately 300 m (985 ft) wide, and the Horseshoe or Canadian Falls, 47 m (158 ft) high and by some estimates well over 800 m (2625 ft) wide
2.
(functioning as sing) a city in W New York State, situated at the falls of the Niagara River. Pop: 78 815 (2001)
3.
(functioning as sing) a city in S Canada, in SE Ontario on the Niagara River just below the falls: linked to the city of Niagara Falls in the US by three bridges. Pop: 78 815 (2001)
Niagara Falls in Culture
Niagara Falls [(neye-ag-ruh, neye-ag-uh-ruh)]

Waterfall in western New York state and southern Ontario, Canada.

Note: Great tourist attraction known as a honeymooners' resort.