diffuser

or dif·fu·sor

[ dih-fyoo-zer ]

noun

1. a person or thing that diffuses.
2. (in various machines or mechanical systems, as centrifugal pumps or compressors) a device for utilizing part of the kinetic energy of a fluid passing through a machine by gradually increasing the cross-sectional area of the channel or chamber through which it flows so as to decrease its speed and increase its pressure.
3. (in a lighting fixture) any of a variety of translucent materials for filtering glare from the light source.
4. a pierced plate or similar device for distributing compressed air for aeration of sewage.

diffuser

/ dɪˈfjuːzə /

noun

1. a person or thing that diffuses
2. a part of a lighting fixture consisting of a translucent or frosted covering or of a rough reflector: used to scatter the light and prevent glare
3. a cone, wedge, or baffle placed in front of the diaphragm of a loudspeaker to diffuse the sound waves
4. a duct, esp in a wind tunnel or jet engine, that widens gradually in the direction of flow to reduce the speed and increase the pressure of the air or fluid
5. photog a light-scattering medium, such as a screen of fine fabric, placed in the path of a source of light to reduce the sharpness of shadows and thus soften the lighting
6. a perforated plate or similar device for distributing compressed air in the aeration of sewage
7. a device, attached to a hairdryer, which diffuses the warm air as it comes out

Word History and Origins

Origin of diffuser¹

First recorded in 1670–80; diffuse + -er ¹

Example Sentences

"He brought a scented diffuser, his own mattress topper, a waffle maker so he could make the breakfast he normally would have," Wightman says.

From BBC

The principles of the new Red Bull are the same as those of its predecessors - a heavily undercut sidepod to provide the best possible airflow to the central floor edge, to scavenge air out of the underfloor there, and to the top of the diffuser, to create a low-pressure area to do the same there.

From BBC

A diffuser can help spread fragrance throughout your home for an extended period of time.

From Seattle Times

Putting essential oils in a diffuser is also an option to revitalize your space.

From Salon

Spices, musk and golden amber evoke a nice vibe in Pura’s Winter Noir diffuser refill.

From Washington Times