ˈstorm ˌwindow BrE AmE noun [countable]
a second window fitted to the outside of a window in winter in the US to give more protection against rain, snow etc
ˈstorm ˌwindow BrE AmE noun [countable]
a second window fitted to the outside of a window in winter in the US to give more protection against rain, snow etc
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012