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