Any device for filling all or part of the opening of a window, particularly if it is ornamental, as the pierced lattices of the Arabs; also, the glass filling of a stained or painted window.(noun)
The Century Dictionary (Public Domain)
Use "window-screen" in a sentence
"(Soundbite of music) WAS: Buddy wasn't but 7 years old when he fashioned his first make-shift instrument out of a lighter-fluid can, some window-screen wire and tacks."
"He'd sit in his ground-floor dorm-room, sheilded by the window-screen, and squirt passers-by, then duck and cover."
"In some towns the streets are nearly straight and cross each other like the wires of a window-screen."