murder hole

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murder hole

An opening in an overhanging medieval defensive structure through which boiling water, boiling oil, or rocks could be dropped on an attacker; also called a machicolation.
References in periodicals archive ?
This is vaulted with murder-holes and pistolloops and, with a fragment of the bawn wall, is earlier than the main house.
An 18ft-wide filled moat, a tidal dock for shipping, 16 towers, three portcullises, a chapel, several gates, a range of tunnels and murder-holes aplenty, Beaumaris is as daunting now as 700 years ago.
The mansion retains a gatehouse with murder-holes, gunloops and the Caulfied arms over the top.