case·ment /ˈkesmənt/
  窗
  Case·ment n.  Arch. A window sash opening on hinges affixed to the upright side of the frame into which it is fitted. (Poetically) A window.
     A casement of the great chamber window.   --Shak.
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  casement
       n : a window shash that is hinged (usually on one side)
  Casement
     a barrier of open-work placed before windows (Prov. 7:6). In
     Judg. 5:28 the Hebrew word is rendered "lattice," in the LXX.
     "network," an opening through which cool air is admitted.