louver

US: /ˈluvɚ/ ,(lo̅o̅′vər)

WordReference Random House Learner's Dictionary of American English © 2025

lou•ver or lou•vre /ˈluvɚ/   n. [countable]

1. Building any of a series of narrow openings on a door or window, produced by slanting, overlapping fins or slats of wood or glass, that can be adjusted for letting in light and air while shutting out rain.
2. Building a fin or slat from such an opening.

lou•vered, adj. 

WordReference Random House Unabridged Dictionary of American English © 2025

lou•ver  (lo̅o̅′vər), n. 

1. Building 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. Building a fin or slat framing such an opening.
3. Building, Architecture a ventilating turret or lantern, as on the roof of a medieval building.
4. Building 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. Building a door, window, or the like, having adjustable louvers.

v.t. 

6. Building to make a louver in;
   add louvers to:
   to louver a door.
   Also,[esp. Brit.,] louvre. 

• Middle Dutch love gallery. See lobby
• Middle French lovier
• Middle English lover 1325–75

lou′vered, adj. 

WordReference Random House Unabridged Dictionary of American English © 2025

lou•vre  (lo̅o̅′vər), n., v.t., -vred, -vring. [Chiefly Brit.]

1. Building, British Terms louver.

Lou•vre  (lo̅o̅′vr^ə), n. 

1. a national museum in Paris, France, since 1793: formerly a royal palace.

Collins Concise English Dictionary © HarperCollins Publishers::

louvre, louver / ˈluːvə/ noun

1. any of a set of horizontal parallel slats in a door or window, sloping outwards to throw off rain and admit air
2. Also called: louvre boards the slats together with the frame supporting them
3. a lantern or turret that allows smoke to escape

Etymology: 14th Century: from Old French lovier, of obscure origin