Diffusor

noun

1. Any person or thing that diffuses.
2. A device designed to diffuse a scent efficiently.
3. Any device that or spreads out or scatters light, making the light appear softer.
4. A shaped section of a car's underbody which improves the car's aerodynamic properties.
5. A mechanical device that is designed to control the characteristics of a fluid at the entrance to a thermodynamic open system.