Definitions

1. noun

a waterfall, especially one in Yosemite National Park, California, USA, that flows over a cliff and into a pool below, creating a spectacular display of water.

“The tourists were awestruck by the sight of the firefall at sunset.”

2. noun

a spectacular or impressive display of something, especially a natural phenomenon.

“The fireworks display was a firefall of color and light in the night sky.”