louvre
noun
[ ˈluːvə ]
• 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.
• "murky light filters through the vertical louvres of the window blinds"
• (in a medieval house) a structure in a roof incorporating openings for the passage of smoke.
Origin:
Middle English (in louvre (sense 2)): from Old French lover, lovier ‘skylight’, probably of Germanic origin and related to lodge.
