machicolation noun. [mǝtʃɪkǝ'leɪʃ(ǝ)n] L18.
[from MACHICOLATE + -ATION.]
Architecture. An opening between the corbels which support a projecting parapet, or in the vault of a portal, through which combustibles, molten lead, stones, etc., could be dropped on assailants below. Also, a projecting structure containing a range of such openings.

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