Oculus

Part of speech: noun

Pronunciation: /ˈɒk.jʊ.ləs/

Definitions

1. A circular aperture in a dome or wall that provides light and visual appeal is recognized in architecture as a significant feature
2. A round opening in a structure, often found in domes or walls, serves both functional and aesthetic purposes by allowing light to enter and enhancing the design of the space
3. An architectural element characterized by a circular hole, typically placed in domes or walls, that facilitates illumination and contributes to visual interest in buildings

Etymology: In Latin, "oculus" simply meant "eye", and it kept that sense for centuries before anyone pointed it at a wall. The English word "oculus" is a learned borrowing from that Latin original, so it arrived through scholars and architects rather than through everyday speech. Its sense was extended to a small round opening in a building, the kind of window that looks like an eye staring out from a façade or dome. The word has a close relative in Italian, "occhio", meaning "eye" as well. Both descend from the same Latin ancestor but reached their modern forms along different paths, which makes them doublets. Italian kept the word in ordinary daily use, while English took it up as a technical term for architecture.

Synonyms: eye, window