An astragal is the proper term for the strip of rubber or felt-like material surrounding the edges of a door for the purpose of sealing out weather elements, air, water, or fire; or for sealing the heat or cool air into a building.

Some astragals are air or water inflated and are used for sealing out biological or chemical contaminants.

As"tra*gal (#), n. [L. astragalus, Gr. the ankle bone, a molding in the capital of the Ionic column.]

1. Arch.

A convex molding of rounded surface, generally from half to three quarters of a circle.

2. Gun.

A round molding encircling a cannon near the mouth.


© Webster 1913.

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