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Latin word oculus comes from Proto-Indo-European *h₃okʷ-, h₃ekʷ-, and later Proto-Italic *okʷelos (Eye.)
*h₃okʷ-, h₃ekʷ- (Proto-Indo-European)
*okʷelos (Proto-Italic)
Eye.
oculus (Latin)
(anatomy) An eye. (botany) a bud, bulb on a root. (by extension) the power of sight. (figuratively) the mind's eye. A spot resembling an eye, such as on a peacock feather.