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[dih-fyoo-zer] /dɪˈfyu zər/
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.
Origin of diffuser
1670-80; diffuse + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for diffuser
  • 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 performance.
  • The other diffuser remained open throughout the event.
  • Light pipes take both direct and diffused sunlight and guide it in a reflective tube to a diffuser.
  • There's no backlight, no diffuser, no polarizers or any of the other baggage that goes with liquid crystals.
  • The rear diffuser controls the airflow exiting the rear of the car and can give an aerodynamic advantage.
  • It comes with two gels: a tungsten conversion gel and a diffuser.
  • It features a different lower fascia with an integral rear diffuser that surrounds quad exhaust outlets.
British Dictionary definitions for diffuser


a person or thing that diffuses
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
a cone, wedge, or baffle placed in front of the diaphragm of a loudspeaker to diffuse the sound waves
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
(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
a perforated plate or similar device for distributing compressed air in the aeration of sewage
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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