storm window

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

1885–90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
storm window
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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