diffusor

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

Collins English Dictionary - Complete & Unabridged 10th Edition
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