oculus

An eyelike opening or ornament, especially.

A round window.

A circular opening at the apex of a dome.

In architecture, a circular window, usually a small one without tracery or other special subdivision; also an opening at the summit of a dome-shaped vault.

In anatomy, the eye; an eye; specifically, a compound eye.

In botany, an eye; a leaf-bud.

A European plant, Inula Oculus-Christi, having astringent properties.

An eye.

A round window, usually a small one.

A leaf bud.