noun dif·fus·er \di-ˈfyü-zər\

Definition of diffuser

  1. 1 :  one that diffuses: as a :  a device (as a reflector) for distributing the light of a lamp evenly b :  a screen (as of cloth or frosted glass) for softening lighting (as in photography) c :  a device (as slats at different angles) for deflecting air from an outlet in various directions

  2. 2 :  a device for reducing the velocity and increasing the static pressure of a fluid passing through a system

Circa 1679

First Known Use of diffuser

circa 1679

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