Definition of machicolation
1a
: an opening between the corbels of a projecting parapet or in the floor of a gallery or roof of a portal for discharging missiles upon assailants below — see battlement illustration
b
: a gallery or parapet containing such openings
2
: construction imitating medieval machicolation
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Merriam-Webster unabridged
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Time Traveler for machicolation
The first known use of machicolation was in 1787
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