Jalousie

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A jalousie (IPA: [ˈdʒæləˌsi] or [ˈʒælʊˌzi]) is a slatted window covering, typically a shutter or window covering, which consists of a set of parallel angled slats. These slats can be opened variously so as to control the amount of air or light allowed to pass through.

A jalousie window has overlapping glass slats which open to allow ventilation. This kind of window is good for sun porches that are not air conditioned. It is not suitable for situations where weathertightness is a priority, since it is impossible to achieve a good seal between panes.

The word can also refer to a pastry. Typically a jalousie is a rectangular flat pastry, with a plain rectangular base, a filling, often fruit based, and a top layer of pasty cut to produce a set of parallel angled slats.