diffuser

dif·fus·er  (d-fyzr)

n.

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.

Thesaurus

Noun	1.	diffuser - baffle that distributes sound waves evenly diffusor baffle, baffle board - a flat plate that controls or directs the flow of fluid or energy
	2.	diffuser - optical device that distributes the light of a lamp evenly diffusor lamp - a piece of furniture holding one or more electric light bulbs lighting fixture - a fixture providing artificial light optical device - a device for producing or controlling light