Definition of oillet in English:

oillet

(also oilet)

noun

historical, archaic
  • An aperture or loophole for observation, especially in a wall; = "eyelet". Now (Architecture): a round opening at the end of an arrow-slit (historical).

Origin

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.

Pronunciation

oillet

/ˈɔɪlɪt/