a person or thing that diffuses.
(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.
(in a lighting fixture) any of a variety of translucent materials for filtering glare from the light source.
a pierced plate or similar device for distributing compressed air for aeration of sewage.
Also, diffusor.

1670–80; diffuse + -er1

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World English Dictionary
diffuser or diffusor (dɪˈfjuːzə)
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
diffusor or diffusor

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Another thing that has been really helpful for us is a pheromone diffuser.
It is simply a matter of replacing the diffuser layer with a
  quantum-dot-enhancement film.
The revised rear end is supposed to look sportier due to the double diffuser
  and a centrally arranged exhaust system.
Air supply diffuser placement influences laboratory air patterns and fume hood
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