A loop forming part of anything, or a hole through anything, to receive a rope, hook, pin, shaft, etc. — e.g. at the end of a tie bar in a bridge truss; through a crank; at the end of a rope; or through a millstone.
That which resembles the eye in relative importance or beauty.
From Middle English eye, eie, yë, eighe, eyghe, yȝe, eyȝe, from Old English ēage, from Proto-West Germanic *augā, from Proto-Germanic *augô (compare Scots ee, West Frisian each, Dutch oog, German Auge, Danish øje, Norwegian Bokmål øye, Norwegian Nynorsk auga, Swedish öga), from Proto-Indo-European *h₃okʷ-, *h₃ekʷ-.
See also Latin oculus (whence English oculus), Lithuanian akìs, Old Church Slavonic око, Albanian sy, Ancient Greek ὀφθαλμός ("eye"), Armenian ակն, Avestan 𐬀𐬱𐬌, Sanskrit अक्षि. Related to ogle.
The uncommon plural form eyen is from Middle English eyen, from Old English ēagan, nominative and accusative plural of Old English ēage.