shutter

The definition of a shutter is a person or thing that covers or closes an opening or window.

(noun)

An example of a shutter is a person who opens and closes the door at a theater.
An example of a shutter is a device on the lens of the camera that opens and closes to control the amount of light entering the camera.
An example of a shutter is a wooden panel that can be opened and closed to cover a window.

See shutter in Webster's New World College Dictionary

noun

a person or thing that shuts
a movable screen or cover for a window, usually hinged and often fitted with louvers
anything used to cover an opening, as a slide or door on a lantern
Photog. a device that controls the duration of an exposure by opening and closing, allowing light to reach the film or plate for a specified amount of time

transitive verb

to close or furnish with a shutter or shutters

See shutter in American Heritage Dictionary 4

noun

One that shuts, as:
a. A hinged cover or screen for a window, usually fitted with louvers.
b. 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.
shutters Music The movable louvers on a pipe organ, controlled by pedals, that open and close the swell box.

transitive verb shut·tered, shut·ter·ing, shut·ters