diffuser

noun8

1. •
   Any person or thing that diffuses.
2. •
   A device designed to diffuse a scent efficiently.

   • They are in the under-$20 section, which includes a display of scented candles and diffusers. — 2009
3. •
   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. — 2008
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.
6. •
   An aerating device consisting of a membrane with fine pores, through which air is blown to generate small bubbles.
7. •
   A cooking item that can be placed above a stove heating element or burner to separate the cooking utensil from the heat source.
8. •
   A hairdryer attachment that diffuses the flow of air.