machicolation

/məˌtʃɪkəˈleɪʃ(ə)n/

IPA: /M AE0 K AH0 K AH0 L EY1 SH AH0 N/

noun
  1. 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. 2

    A projecting parapet with a series of such openings.

Synonyms

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Source: https://en.wiktionary.org/wiki/machicolation