machicolation ( synonym found)
Definition of machicolation:

(n) : 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 upon assailants attacking the base of the walls. Also, the construction of such defenses, in general, when of this character; the act of discharging missiles or pouring burning or melted substances upon assailants through such apertures
Definition of machicolation:

(n) : 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 upon assailants attacking the base of the walls. Also, the construction of such defenses, in general, when of this character; the act of discharging missiles or pouring burning or melted substances upon assailants through such apertures
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