1. a set of thin, parallel slats or blades arranged at an angle in a frame, used to control the flow of air or light while blocking direct view
Usage: also spelled 'louver' in U.S. English
2. an opening in a roof or wall fitted with louvres to allow ventilation while excluding rain or snow
Usage: architectural term

Examples

• She adjusted the louvres on the window to let in more light.
• The car's hood has louvres to improve engine ventilation.
• Louvres on the attic wall help prevent moisture buildup.
• The office blinds have adjustable louvres for privacy control.
• The louvre system in the building's facade reduces heat gain.