louvre
n. countablen. a set of thin, flat slats in a window or door that are tilted to let in air and light while keeping out rain and direct sun. You often see them on shutters or in bathroom windows.
n. a series of overlapping slats, often made of wood, glass, or metal, angled to allow ventilation while obstructing rain and direct sunlight. Frequently used in industrial or tropical architecture to regulate airflow without compromising privacy.
He adjusted the louvre to let more fresh air into the room.
The architect specified glass louvres for the facade to ensure the building remained cool during the summer months.
By tilting the wooden louvres, the residents could maintain a degree of privacy from the street while still benefiting from the cooling evening breeze.
Borrowed from French Louvre. More at Louvre Palace.
Often used in the plural form when referring to a window or door unit containing multiple slats.