machicolation

詳細解釋：

ma.chic.o.la.tion

n.（名詞）

A projecting gallery at the top of a castle wall, supported by a row of corbeled arches and having openings in the floor through which stones and boiling liquids could be dropped on attackers.
有堞式射擊口的胸牆：在堡城上部突出的長廊，由一排靠梁托支持的弓形結構支撐，通過長廊在地面的開口可向進攻者投擲石塊和傾倒沸水
One of these openings.
堞眼：這些開口之一
A row of small corbeled arches used as an ornamental architectural feature.
堞式建築物：用作建築裝飾特徵的一排由梁托支撐的弓形結構