Definition of "shutter" []

• One that shuts, as: (noun)
• A hinged cover or screen for a window, usually fitted with louvers. (noun)
• 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. (noun)
• Music The movable louvers on a pipe organ, controlled by pedals, that open and close the swell box. (noun)
• To furnish or close with shutters: locked the doors and shuttered the windows. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The exposure time set on the camera just has to be long enough for the action to happen while the shutter is still open."
• "The main purpose for the shutter is to offer the complete freedom of choosing the extent to which we want the elements to play a part in out interiors."
• "To get the right fraction of a second, we must factor in shutter lag."