diffuser

(di fyo̵̅o̅zər)

or diffusor

noun

a person or thing that diffuses, as a device for distributing light evenly

See diffuser in American Heritage Dictionary 4

noun
  1. One that diffuses, as:
    a. A light fixture, such as a frosted globe, that spreads light evenly.
    b. A medium that scatters light, used in photography to soften shadows.
    c. A device, such as a cone or baffle, placed in front of a loudspeaker diaphragm to diffuse the sound waves.
  2. A flow passage in a wind tunnel that decelerates a stream of gas or liquid from a high to a low velocity.

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