Illustrated Architecture Dictionary .

Oculus
Plural: oculi
Pronunciations: AHK you lis; AHK you lie

Pantheon

Window that has an oval or circular shape resembling an eye, without tracery or muntins.

A round oculus is also called a bulls-eye window (oeill-de-boeuf in French)

The round opening at the top of some domes, or cupolas, e.g., Pantheon in Rome

The center of volutes or spiral scrolls in Ionic columns

Etymology: Latin, "eye"

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Examples:

• Illustration above: Pantheon, Rome, Italy
  
  
• Forum Thermal Baths, Pompeii, Italy

• Palermo Cathedral, Sicily

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