Main Entry: ¹shut·ter

Pronunciation: \ˈshə-tər\

Function: noun

Date: 1542

1 : one that shuts
2 : a usually movable cover or screen for a window or door
3 : a mechanical device that limits the passage of light; especially : a camera component that allows light to enter by opening and closing an aperture
4 : the movable louvers in a pipe organ by which the swell box is opened

— shut·ter·less \-ləs\ adjective