[jal-uh-see or, esp. British, zhal-oo-zee]
a blind or shutter made with horizontal slats that can be adjusted to admit light and air but exclude rain and the rays of the sun.
a window made of glass slats or louvers of a similar nature.

1585–95; < French < Italian gelosia jealousy; so called because such blinds afford a view while hiding the viewer

jalousied, adjective
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World English Dictionary
jalousie (ˈʒælʊˌziː)
1.  a window blind or shutter constructed from angled slats of wood, plastic, etc
2.  a window made of similarly angled slats of glass
[C19: from Old French gelosie latticework screen, literally: jealousy, perhaps because one can look through the screen without being seen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1766, from Fr., lit. "jealousy" (see jealous), from notion of looking through blinds without being seen.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The north facade fenestration, separated by brick and stone pilasters, has also
  been replaced with jalousie units.
Ensure that jalousie windows operate correctly, or have clips added if they do
The units are designed for natural cross ventilation and will be constructed
  with jalousie windows, patios and balconies.
Repair jalousie windows that do not fully close by installing clips to hold the
  windows closed.
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