- a supplementary window sash for protecting a window against drafts, driving rain, etc.
Origin of storm window
First recorded in 1885–90
Also called storm sash.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for storm window
- an additional window fitted to the outside of an ordinary window to provide insulation against wind, cold, rain, etc
- a type of dormer window