storm window

noun
1.
a supplementary window sash for protecting a window against drafts, driving rain, etc.
Also called storm sash.
Origin
1885-90
Examples from the web for storm window
  • 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.
  • storm window treatments should be consistent with the character and detail of the historic window opening and overall facade.
British Dictionary definitions for storm window

storm window

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