machicolation
/məˌt͡ʃɪkəˈleɪʃən/noun
University
1
An opening between corbels that support a projecting parapet, or in the floor of a gallery or the roof of a portal, of a fortified building from which missiles can be shot or heated items dropped upon assailants attacking the base of the walls.
2
A projecting parapet with a series of such openings.
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