- noun a folding wooden or metal cover for a window
- noun the part of a camera which opens and closes very quickly to allow the light to go on to the film
- noun a hinged door which controls the flow of air
Cars & Driving
- noun the curved metal vane of a Hall generator
- A movable cover or screen used to cover an opening, especially a window opening.
- noun a mechanical part of a camera that opens and closes the lens aperture to expose the film or plate to light