1. A circular opening or window, especially in a dome or wall
   "Sunlight streamed through the oculus of the Pantheon"
    
2. [rare] The organ of sight
   "The human oculus is a complex structure capable of detecting light and colour";
   - eye, optic

Derived forms: oculi

Type of: receptor, sense organ, sensory receptor

Part of: face, human face, visual system

Encyclopedia: Oculus