weather strip

noun
1.
a narrow strip of metal, wood, rubber, or the like placed between a door or window sash and its frame to exclude rain, wind, etc.
Origin
1840-50, Americanism

weather-strip

[weth -er-strip] /ˈwɛð ərˌstrɪp/
verb (used with object), weather-stripped, weather-stripping.
1.
to apply weather stripping to (something).
Origin
1890-95, Americanism
British Dictionary definitions for weather strip

weather strip

noun
1.
a thin strip of compressible material, such as spring metal, felt, etc, that is fitted between the frame of a door or window and the opening part to exclude wind and rain Also called weatherstripping