shutter

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shutter 

A device that provides a means (mechanical or electro-optical) for letting a beam of light pass during a given length of time.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in classic literature ?
Under his escort she went tardily forward to the main front, whose shuttered windows, like sightless eyeballs, excluded the possibility of watchers.
The three blows were scarcely struck, when the inside blind was opened and a light appeared through the panes of the outside shutter.
"We are not English," said my companion, watching me helplessly while I threw open the shutters of one of the divisions of the wide high window.
Now, would you have the kindness to go into your room and bar your shutters?"
The house was readily found; for there were still many persons gazing up at the closed shutters, with an objectless curiosity, from the opposite side of the way.
When Elizabeth was attired, she approached a window and drew its curtain, and throwing open its shutters she endeavored to look abroad on the village and the lake.
The lower shutters would not be closed at that hour; and if they were, she could lay her hand on the Bible, in its place on the parlor book-shelf, in the dark.
It had a wide door in front and a broad shutter at each side.
A second door, leading from the bed-chamber into the yard, was locked; and the wooden shutter protecting the one window of the room was carefully barred.
'Tis some one knocking softly at the shutter. Who can it be!'
At this moment, the shutter of a window opened, and disclosed the sallow face and the dark eyes of the young man, who with intense interest watched the scene which was preparing.
When I got back and entered, the king was within, and was opening the shutter that closed the window-hole, to let in air and light.