storm window

American  

noun

1. a supplementary window sash for protecting a window against drafts, driving rain, etc.

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storm window British  

noun

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

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Etymology

Origin of storm window

First recorded in 1885–90

Example Sentences

A woman who looks him up and down and asks if he’s gotten the celebrity thing out of his system because she needs help putting up her storm windows.

From Los Angeles Times

Make sure your windows and storm windows are closed, and keep those air gaps as sealed as you can.

From Seattle Times

“The storm window is open,” Hall said, adding that the continuous soggy forecast is “a rare pattern we get to see every once in a while.”

From Los Angeles Times

However, if that's not in the budget, storm windows are an effective alternative.

From Salon

“It is like putting up the storm windows after the storm has passed.”

From Los Angeles Times