shutter

Concise Oxford English Dictionary © 2008 Oxford University Press:
shutter/ˈʃʌtə(r)/

▶noun

• 1 each of a pair of hinged panels fixed inside or outside a window that can be closed for security or privacy or to keep out the light.

• 2 Photography a device that opens and closes to expose the film in a camera.

• 3 Music the blind enclosing the swell box in an organ, used for controlling the volume of sound.

▶verb close the shutters of (a window or building).

– derivatives
shuttering noun,
shutterless adjective.