A stream.
A lava flow.
A deep gulch or ravine, frequently dry in summer.
A reach of water in a bayou that is like a slough but deeper.
A fluid that flows out.
Any outward movement.
Something that flows out of a sewage treatment plant.
The process of flowing out.
A stream of gaseous material emanating from an active galactic nucleus.
The part of a system that allows material to flow out.
To flow outward.