"Each of a set of angled slats fixed or hung at regular intervals in a door, shutter, or screen to allow air or light to pass through", Middle English (in sense 2): from Old Frenchlover, lovier 'skylight', probably of Germanic origin and related to lodge. More The first sense recorded was to describe a domed structure on a roof with side openings for ventilation: louvre comes from Old French lover, lovier ‘skylight’, probably of Germanic origin and related to lodge ( see lobby).[louvre etymology, louvre origin, 英语词源]