» For the French museum, see the Louvre A louver (American English) or louvre (British English), from the French l'ouvert; "the open one")'s a window, blind or shutter with horizontal or, less often, vertical slats, that're angled to admit light and air, but to keep out rain, direct sunshine, and noise. The angle of the slats may be adjustable, usual in blinds and windows, or fixed. As building management services has improved and technology has quickly changed, these louvers have been automate… (More on Louver)