Definition of "louver" [lou•ver]

• 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. (noun)
• One of the slats used in such an opening. (noun)
• One of the narrow openings formed by such slats. (noun)
• A slatted, ventilating opening, as on the hood of a motor vehicle. (noun)
• A lantern-shaped cupola on the roof of a medieval building for admitting air and providing for the escape of smoke. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "All air and exhaust outlets are installed beneath the sash, letting air run outside through the terrace louver."
• "Richards says the repair involves applying an adhesive to refasten the louver to the hood."
• "Hummer spokesman Nick Richards says louver on the hood can come loose and possibly detach while driving."