oculus

Noun

Singular oculus

Plural oculi

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

1. An oculus (plural: oculi) 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.
3. The Latin word for "eye," used in medical terms relating to vision or eye structures.
4. A brand name for virtual reality (VR) headsets, originally developed by Oculus VR (now part of Meta).