Definition of diffuser
1 : one that diffuses: such asa : a device (such as a reflector) for distributing the light of a lamp evenlyb : a screen (as of cloth or frosted glass) for softening lighting (as in photography)c : a device (such as slats at different angles) for deflecting air from an outlet in various directions
2 : a device for reducing the velocity and increasing the static pressure of a fluid passing through a system
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