noun the act of discharging missiles or pouring burning or melted substances upon assailants through such apertures.
2. machicolation ·noun an opening between the corbels which support a projecting parapet, or in the floor of a gallery or the roof of a portal, shooting or dropping missiles upen assailants attacking the base of the walls. also, the construction of such defenses, in general, when of this character. ·see illusts. of battlement and castle.