gobo
(noun)
noun
1. (film, television) A disc placed between a light and the illuminated object or actor in order to diffuse the glare.
2. (theater) A template inserted over a light source in order to control the shape of the thrown light.
3. A device used to shield a microphone from extraneous sounds.
4. The taproot of young burdock plants, eaten as a root vegetable.