oculus

noun /ˈɒk.jʊ.ləs/

1. A window or other opening that has an oval or circular shape (as of an eye). — The central boss of a volute.

2. A window or other opening that has an oval or circular shape (as of an eye). — An opening at the apex of a dome.

   One can glimpse the sky through the oculus of the Pantheon in Rome.

Where it comes from

Learned borrowing from Latin oculus (“eye”). Doublet of occhio.

Adapted from the Wiktionary entry oculus (CC BY-SA 4.0).

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