diffuser

Any person or thing that diffuses.

A device designed to diffuse a scent efficiently.

They are in the under-$20 section, which includes a display of scented candles and diffusers.

Any device that or spreads out or scatters light, making the light appear softer.

Along the sofa every three and a half feet, fluorescent tubes glow through translucent plastic diffusers.

A shaped section of a car's underbody which improves the car's aerodynamic properties.

A mechanical device that is designed to control the characteristics of a fluid at the entrance to a thermodynamic open system.