in Architecture, a covered place in a house, of much greater length than breadth, and usually in the wings of a building, its use being chiefly to walk in.

in Fortification, a covered walk across the ditch of a town, made of strong beams covered with planks, and loaded with earth. Sometimes it is covered with raw hides, to defend it from the fire of the besieged.

GALLERY of a Mine is a narrow passage or branch of a mine carried on under ground to a chamber in a work designed to be blown up.