jalousie

noun3

1. •
   A component in a ventilation system.
2. •
   Upward sloping window slats which form a blind or shutter, allowing light and air in but excluding rain and direct sun.

   • There were broad windows facing the sea and to the right of them a door leading on to the beach. White plastic jalousies were drawn half up the windows to cut the glare from the sand. — 1954
3. •
   A pastry with the upper side sliced before final baking to resemble a wooden slatted blind.