1. a circular opening in the center of a dome or wall
Usage: architecture
2. the eye
Usage: medical; formal

Examples

• The Pantheon in Rome features a famous oculus at the top of its dome.
• Light streams through the oculus, illuminating the interior space below.
• The architect designed an oculus to provide natural ventilation.
• Ancient Roman buildings often incorporated an oculus as a design element.
• The doctor examined the patient’s oculus for signs of infection.
• The oculus allows rainwater to enter the building during storms.