\Mach`i*co*la"tion\, n. [Cf. LL. machicolamentum,
machacolladura, F. m[^a]chicolis, m[^a]checoulis; perh. fr.
F. m[`e]che match, combustible matter + OF. coulis, couleis,
flowing, fr. OF. & F. couler to flow. Cf. {Match} for making
fire, and {Cullis}.]
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, 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}.
2. The act of discharging missiles or pouring burning or
   melted substances upon assailants through such apertures.