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storm window

noun

Simple Definition of storm window

  • : a second window that covers the usual outside window of a building for protection against cold and bad weather

Source: Merriam-Webster's Learner's Dictionary

Full Definition of storm window

  1. :  a sash placed outside an ordinary window as a protection against severe weather —called also storm sash

Circa 1888

First Known Use of storm window

circa 1888


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