In architecture, arbalestena (also known as balistraria) are cruciform apertures in the walls of ancient fortifications through which arrows were discharged by the defenders against attacking armies. Research Arbalestena
In architecture an oillet is a small opening or loophole, sometimes circular, used in mediaeval fortifications from which defenders would shoot arrows at besiegers (see also arbalestena). The term is also used to describe a small circular opening, and ring of mouldings surrounding it, used in window tracery in Gothicarchitecture. Research Oillet
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Abbreviations
Research Arbalestena
