From the Internet free dictionary
lou·ver also lou·vre (lvr) n.
1.
a. A framed opening, as in a wall, door, or window, fitted with fixed or movable horizontal slats for admitting air and light and shedding rain.
b. One of the slats used in such an opening.
c. One of the narrow openings formed by such slats.
2. A slatted, ventilating opening, as on the hood of a motor vehicle.
3. A lantern-shaped cupola on the roof of a medieval building for admitting air and providing for the escape of smoke.
