ETYM French jalousie. Related to Jealous, Jalousie.
1. A feeling of jealous envy (especially of a rival); SYN. green-eyed monster.
2. Zealous vigilance.

ETYM Old Eng. lover, Old Fren. lover, lovier; or l'ouvert the opening, from overt, ouvert, p. p. of ovrir, ouvrir, to open, French ouvrir. Related to Overt.
One of a set of parallel slats in a door or window to admit air and reject rain; SYN. louvre, fin.

A window blind made of horizontal strips that overlap when closed.
A blind (as for a window) having numerous horizontal slats that may be set simultaneously at any of several angles so as to vary the amount of light admitted.