The Collaborative International Dictionary of English v.0.48:

Jalousie \Ja`lou`sie"\, n. [F. See Jealousy.]
   1. A Venetian or slatted inside window blind.
      [1913 Webster]

   2. A window or door made of multiple glass or plastic slats,
      which can be opened or closed like a jalousie[1].
      [PJC]

WordNet (r) 3.0 (2006):

jalousie
    n 1: a window with glass louvers [syn: louvered window,
         jalousie]
    2: a shutter made of angled slats