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From Latin oculus ‎(eye).


oculus ‎(plural oculi)

  1. (architecture) A window or other opening that has an oval or circular shape (as of an eye).
    One can glimpse the sky through the oculus of the Pantheon in Rome.



oculus (an eye)

Alternative forms[edit]


From Proto-Italic *okelos, from Proto-Indo-European *h₃okʷ-, *h₃ekʷ- ‎(eye; to see), probably through a later root *ōkʷelos. Cognates include with Sanskrit अक्षि ‎(ákṣi), Ancient Greek ὄσσε ‎(ósse), Gothic 𐌰𐌿𐌲𐍉 ‎(áugō), Old English ēaġe (English eye), Proto-Slavic *oko.



oculus m ‎(genitive oculī); second declension

  1. an eye
    • 63 BCE, Cicero, Catiline Orations (Latin text and English translations here)
      Quam diu quisquam erit qui te defendere audeat, vives, et vives ita ut nunc vivis, multis meis et firmis praesidiis obsessus ne commovere te contra rem publicam possis. Multorum te etiam oculi et aures non sentientem, sicut adhuc fecerunt, speculabuntur atque custodient.
      "As long as one person exists who can dare to defend you, you shall live; but you shall live as you do now, surrounded by my many and trusty guards, so that you shall not be able to stir one finger against the republic: many eyes and ears shall still observe and watch you, as they have hitherto done, though you shall not perceive them."
    • 405, Jerome and others, Vulgate, Isaias 64:4
      a saeculo non audierunt neque auribus perceperunt oculus non vidit Deus absque te quae praeparasti expectantibus te
      "For since the beginning of the world men have not heard, nor perceived by the ear, neither hath the eye seen, O God, beside thee, what he hath prepared for him that waiteth for him."
  2. (by extension) the power of sight
  3. a spot resembling an eye, such as on a peacock feather
  4. (botany) a bud, bulb on a root
  5. (figuratively) the mind's eye


Second declension.

Case Singular Plural
nominative oculus oculī
genitive oculī oculōrum
dative oculō oculīs
accusative oculum oculōs
ablative oculō oculīs
vocative ocule oculī

Derived terms[edit]

Related terms[edit]