Webster's English Dictionary

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louver

lou.ver or lou.vre \'lu:-v*r\ \-v*rd\ n [ME lover, fr. MF lovier] 1: a roof 
   lantern or turret often with slatted apertures for escape of smok e or 
   admission of light in a medieval building 2a: an opening provided with one 
   or more slanted fixed or movable fins to a llow flow of air but to exclude 
   rain or sun or to provide privacy 2b: a finned or vaned device for 
   controlling a flow of air or the radiation  of light 2c: a fin or shutter 
   of a louver  - lou.vered aj