One of the mysteries of the English language finally explained.
An aperture or loophole for observation, especially in a wall; = "eyelet". Now (Architecture): a round opening at the end of an arrow-slit (historical).
Middle English. From Anglo-Norman oillet, ollet little eye and Middle French oeuillet, oillet, oeillet (French oeillet) small round hole in fabric, little eye, window surround in form of an eye, small eye of a plant from Anglo-Norman oil, Middle French oeïl eye + -et.
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