Definition of diffuser
1
: one that diffuses: such as
a
: a device (such 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 (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
