The term 'waterfall spray' can be summarized as a MIST, which is a fine spray of liquid droplets in the air. It is often seen in nature when water cascades over a cliff or waterfall, creating a fine MIST of droplets that can be seen in the air. This MIST is also created artificially, such as when a garden hose is used to spray water. In both cases, the MIST is composed of tiny droplets of water suspended in the air.