oculus

[ok-yuh-luhs]
noun, plural oculi [ok-yuh-lahy] .
1.
an eye.
2.
Architecture. a circular opening, especially one at the apex of a dome.
3.
Archaeology. a design representing an eye, as on funerary pottery found in megalithic tombs of Europe.

Origin:
< Neo-Latin, Latin: eye

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

oculus
pl. oculi, from L. oculus "eye" (see eye).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

oculus oc·u·lus (ŏk'yə-ləs)
n. pl. oc·u·li (-lī')
Abbr. O
Eye.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Go when it's raining to watch the drops shower through the oculus, the hole in
  the dome's top.
The oculus, the round opening at the top of the dome, allows the sun's rays to
  illuminate different sections of the interior.
It enters through the oculus on top, which provides the only light for the
  interior.
The gable end features a boxed cornice with returns and a blind oculus.
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