The term ED, EDD N ___ is solved by the word 'EDDY', which is a four-letter word. An EDDY is a small whirlpool or current of water that flows in a circular motion. It is usually found in rivers and streams, and is caused by the uneven flow of water around an obstacle or obstruction. Eddies can also be found in the atmosphere, where they are created by the uneven flow of air around an obstacle. Eddies can be beneficial to aquatic life, as they provide areas of shelter and protection from predators.