Shutter

n.	1.	One who shuts or closes.
	2.	A movable cover or screen for a window, designed to shut out the light, to obstruct the view, or to be of some strength as a defense; a blind.
	3.	A removable cover, or a gate, for closing an aperture of any kind, as for closing the passageway for molten iron from a ladle.
	4.	(Photog.) A mechanical device of various forms, attached to the aperture of a camera lens for opening and closing to expose the plate. It is usually designed so that the time during which the aperture is opened may be varied by a manual dial or by some automatic mechanism, thereby allowing proper exposure of a photographic film under different intensities of light.

Noun	1.	shutter - a mechanical device on a camera that opens and closes to control the time of a photographic exposure
	2.	shutter - a hinged blind for a window
Verb	1.	shutter - close with shutters; "We shuttered the window to keep the house cool"

close, shut