A steep descent of water from a height; a cascade.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "waterfall" in a sentence
"Jen #109: They did add extra scenes in the movie (hence Victoria at prom) & the waterfall is at the part where they go hiking to the meadow."
"I was glad to observe that she wore her own hair, plaited in thick braids against the back of her head, instead of the uncomely thing they call a waterfall, which is about as much like"
"Cascading waterfall from the washbasin to the bathtub"