window sash

the frame holding the pane of a window.

1755–65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
window sash
a glazed window frame, esp one that opens

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Put behind a door or balanced on a window sash, it would sound the alarm when
Air conditioner must have stopping devices installed to limit the elevation of
  the lower window sash to the height of the unit.
Modification of the window sash was accomplished off site.
Meeting rails and mullions must align with those of the primary window sash.
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