weatherstrip

From weather +‎ strip.

weatherstrip (plural weatherstrips)

1. (US) A narrow piece of material used to prevent cold air from entering a building through the edge of a window or a door.

• draughtproofing (British)

weatherstrip (third-person singular simple present weatherstrips, present participle weatherstripping, simple past and past participle weatherstripped)

1. To apply such a strip.

• draughtproof (British)