Main Entry: lou·ver

Variant(s): or lou·vre \ˈlü-vər\

Function: noun

Etymology: Middle English lover, from Anglo-French

Date: 14th century

1 : a roof lantern or turret often with slatted apertures for escape of smoke or admission of light in a medieval building
2 a : an opening provided with one or more slanted fixed or movable fins to allow flow of air but to exclude rain or sun or to provide privacy b : a finned or vaned device for controlling a flow of air or the radiation of light c : a fin or shutter of a louver

— lou·vered also lou·vred \-vərd\ adjective