Diffuser

The term diffuser

A component in the fluid mechanics, see diffuser
The back raised tail of the underbody at the rear of a race car, see diffuser ( Motorsport)
In photography an essay for a flash unit through which the flash light is scattered, see diffuser ( Photography )
A filter, the light uniformly distributed in optics, see diffuser ( optical )
Acoustics an element that scatters the noise, see diffuser ( acoustic )