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oillets
Arrow slits in the walls of medieval fortifications, but more strictly applied to the round hole or circle with which the openings terminate.
oillet a loophole, the rounded area at the head of an arrow slits in the walls of medieval fortifications; also applied to the small eyelets inserted into tracery ornament, sometimes varied as trefoils or quatrefoils.
Oilet, Oillet: The circular part of an arrow slit situated at the ends, the middle, the bottom or all of the above mentioned, which was used to give archers a greater field of fire. Also known as a loop or spy-hole. See loop (2).
 See also: Greek, Architecture, Corbel, Perpendicular, Trefoil
  
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