machicolation

military architecture

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In castle
…defended by portcullises, doors, and machicolations. Portcullises were generally made of oak, were plated and shod with iron, and were moved up and down in stone grooves, clearing or blocking the passage. Machicolations were of two kinds: some were openings in the roof of the passage through which missiles were…
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In military technology: Stone fortifications
Hoardings gave way to machicolations, permanent overhanging galleries of stone that became a distinctive feature of medieval European fortress architecture.
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