shutter

shut|ter /ʃ'ʌtər/ (shutters)
1 [N-COUNT]
The shutter in a camera is the part which opens to allow light through the lens when a photograph is taken.
There are a few things you should check before pressing the shutter release.
2 [N-COUNT] usu pl
Shutters are wooden or metal covers fitted on the outside of a window. They can be opened to let in the light, or closed to keep out the sun or the cold.
She opened the shutters and gazed out over village roofs.