storm window

noun
a supplementary window sash for protecting a window against drafts, driving rain, etc.
Also called storm sash.


Origin:
1885–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
storm window
 
n
1.  an additional window fitted to the outside of an ordinary window to provide insulation against wind, cold, rain, etc
2.  a type of dormer window

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Storm window frames shall match the window frame color-, clear or mill finished
  aluminum frames are not appropriate.
Prototypes of insulated thermal glazing and integral storm window systems were
  promoted in construction journals.
Plastic interior storm window kits are available from certain hardware stores
  or online at surprisingly reasonable prices.
Remove and properly dispose of existing storm window and provide and install a
  new double track storm window in existing opening.
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