CORRIDOR, or CORRIDOR, in fortification, a road or way along the edge of the ditch, without-side; encompassing the whole fortification. The word comes from the Italian coridore, or the Spanish corridor.

It is also called the cover-way; because covered with a glacis, or esplanade, serving it as a parapet. The corridor is about 20 yards broad.

Corridor is also used in architecture, for a gallery or long istle around a building, leading to several chambers at a distance from each other, sometimes wholly inclosed, and sometimes open on one side.