Discover the world of architecture, inside out.
(Latin: eye) In architecture, any of several elements resembling an eye, such as a round or oval window or the round opening at the top of some domes (see Pantheon). The capital of an Ionic column features an oculus in the form of a disk at the centre of each of its spiral scrolls.
Find more information on oculus. Upgrade to Britannica Online for more on oculus.