[shut.ter] n (1542) 1: one that shuts
2: a usu. movable cover or screen for a window or door
3: a mechanical device that limits the passage of light; esp: a camera attachment that exposes 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 -- shut.ter.less adj
[2]shutter vt (1826) 1: to close by or as if by shutters
2: to furnish with shutters