jalousie

noun

Etymology: Borrowed from French jalousie. Doublet of jealousy.

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.

   “A small lofty room, with its window wide open, and the wooden jalousie-blinds closed, so that the dark night only showed in slight horizontal lines of black, alternating with their broad lines of stone colour.”

   “Nowhere the glitter of a glass casement; Venetian blinds, jalousies, closed every window, and rooms projected in all directions to catch the luxury of a through-draft of air.”

3. A pastry with the upper side sliced before final baking to resemble a wooden slatted blind.