This is the word used to describe something that is flowing downward. The first part of the word, adah (or sometimes hadah), denotes the downward direction. For example, water (tó) from melting snow (yas) flows downward from the mountain (dził). Smoke may flow downward into a valley and settle there. Or, it may be fog, or clouds that flow.
A slight variation of this word is Adahwiilíní, which is the name for the Grand Falls located West of Leupp, AZ. This can be considered a proper noun, or it can also be applied to other waterfalls.