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diffuser

[dih-fyoo-zer] /dɪˈfyu zər/
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.
Origin of diffuser
1670-1680
1670-80; diffuse + -er1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for diffuser

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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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