Webster's English Dictionary

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shutter

1. shut.ter \'sh*t-*r\ n often attrib  1: one that shuts  2: a movable 
   cover or screen for a window or door  3: a mechanical device of various 
   forms attached to a camera to expose the  film or plate by opening and 
   closing an aperture 4: the movable louvers in a pipe organ by which the 
   swell box is opened 
2. shutter vt 1: to close with or by shutters  2: to furnish with shutters