nounchiefly North American
A window fixed outside a normal window for protection and insulation in bad weather or winter.
- There was a small four pane window covered by a storm window at the end opposite the door.
- The units are spaced with a 1-to 2inch gap between the storm window and existing window.
- Like a storm window, double-glazed glass creates insulation by using an extra sheet of glass to create an air pocket.
For editors and proofreaders
Syllabification: storm win·dow
Definition of storm window in:
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