Meaning of diffuser

dif•fus•er

Pronunciation: (di-fy'zur), [key]
— n.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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