shutter

One that shuts, as.

A hinged cover or screen for a window, usually fitted with louvers.

A mechanical device of a camera that controls the duration of a photographic exposure, as by opening and closing to allow light coming through the lens to expose a plate or film.

The movable louvers on a pipe organ, controlled by pedals, that open and close the swell box.

To furnish or close with shutters.

To cause to cease operations; close down.

To provide or cover with shutters.

To separate or hide by shutters.

One who or that which shuts.

Hence, specifically— A frame or panel of wood or iron or other strong material used as a cover, usually for a window, in order to shut out the light, to prevent spectators from seeing the interior, or to serve as a protection for the aperture. There are inside and outside shutters. Inside shutters are usually in several hinged pieces which fold back into a recessed casing in the wall called a boxing. The principal piece is called the front shutter, and the auxiliary piece a back flap. Some shutters are arranged to be opened or closed by a sliding movement either horizontally or vertically, and others, particularly those for shops, are made in sections, so as to be entirely removable from the window. Shutters for shop-fronts are also made to roll up like curtains, to fold like Venetian blinds, etc.