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.
a fin or slat framing such an opening.
a ventilating turret or lantern, as on the roof of a medieval building.
any of a system of slits formed in the hood of an automobile, the door of a metal locker, etc., used especially for ventilation.
a door, window, or the like, having adjustable louvers.
verb (used with object)
to make a louver in; add louvers to: to louver a door.
Also, especially British, louvre.

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

louvered, adjective

louver, Louvre, lover.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
louvre or (US) louver (ˈluːvə)
1.  a.  any of a set of horizontal parallel slats in a door or window, sloping outwards to throw off rain and admit air
 b.  Also called: louvre boards the slats together with the frame supporting them
2.  architect a lantern or turret that allows smoke to escape
[C14: from Old French lovier, of obscure origin]
louver or (US) louver
[C14: from Old French lovier, of obscure origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1367, "domed turret-like structure atop a building to disperse smoke and admit light," from O.Fr. lovier, of uncertain origin. One theory connects it to M.L. *lodarium, which might be from a Gmc. source (cf. O.H.G. louba "upper room, roof;" see lobby). Another suggests it
is from Fr. l'ouvert, lit. "the open place," from le, definite article, + pp. of ouvrir "to open." Meaning "overlapping strips in a window (to let in air but keep out rain)" first recorded 1555. The form has been influenced by unrelated Fr. Louvre, the name of the palace in Paris, which is said to be so named because its builder, Philip Augustus, intended it as a wolf kennel.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Using the aluminum louver as a template, trace an inside circle so that the
  louver will fit snugly and not fall in.
Natural light will filter in through a louver system, part of the building's
Remove the plywood that covers the fresh air louver in the boiler room.
The light modules are fitted with a snoot and hex cell louver to cut down high
  angle glare from the face of the lamp.
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