Pronunciation: (lOO'vur),[key] —n. 1. any of a series of narrow openings framed at their longer edges with slanting, overlapping fins or slats, adjustable for admitting light and air while shutting out rain.
2. a fin or slat framing such an opening.
3. a ventilating turret or lantern, as on the roof of a medieval building.
4. any of a system of slits formed in the hood of an automobile, the door of a metal locker, etc., used esp. for ventilation.
5. a door, window, or the like, having adjustable louvers.
—v.t. to make a louver in; add louvers to: to louver a door.Also,esp. Brit.,louvre.