oculus

Pronunciation

• (UK) IPA ^(key): /ˈɒk.jʊ.ləs/
• (US) IPA ^(key): /ˈɑk.jə.ləs/

• Audio (US)

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Noun

Singular oculus

Plural oculi

The oculus at the top of the dome of the Pantheon in Rome

1. (countable) An oculus is a round, eye-like opening or design element, most commonly found at the center of a dome or in a wall.
2. A circular window or opening, famously seen at the top of the Pantheon dome in Rome, which lets in natural light and air.