storm window

Definition of Storm Window in English :

1. storm sash, storm window

a window outside an ordinary window to protect against severe weather or winter

WordNet Lexical Database for English. Princeton University. 2010.

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

a window placed outside a regular window as protection against winter weather

: also storm sash

n.

A secondary window attached over the usual window to protect against the wind and cold.