a. [ LL. machicolatus, p. p. of machicolare, machicollare. See Machicolation. ] Having machicolations. “Machicolated turrets.” C. Kingsley. [ 1913 Webster ]

n. [ Cf. LL. machicolamentum, machacolladura, F. mâchicolis, mâchecoulis; perh. fr. F. mèche match, combustible matter + OF. coulis, couleis, flowing, fr. OF. & F. couler to flow. Cf. Match for making fire, and Cullis. ] [ 1913 Webster ]

1. (Mil. Arch.) An opening between the corbels which support a projecting parapet, or in the floor of a gallery or the roof of a portal, for shooting or dropping missiles upon 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. [ 1913 Webster ]

2. The act of discharging missiles or pouring burning or melted substances upon assailants through such apertures. [ 1913 Webster ]