A shutter used to darken or secure a window.(noun)
The Century Dictionary (Public Domain)
Use "window-shutter" in a sentence
"A moment later, the window-shutter was closed, and the sound of a bar of iron which was placed against it was audible outside."
"Then she remembered that on stepping in by the casement and closing it, she had not fastened the window-shutter, so that a streak of light from the interior of the room might have revealed her vigil to an observer on the lawn."
"Henri then sprung across the room, and, opening a window-shutter, they perceived, that the man had fallen over a chair near the hearth, in which Ludovico had been sitting; — for he sat there no longer, nor could any where be seen by the imperfect light, that was admitted into the apartment."