Oeil-de-boeuf, also œil de bœuf, (French

French language

French is a Romance language spoken as a first language in France, the Romandy region in Switzerland, Wallonia and Brussels in Belgium, Monaco, the regions of Quebec and Acadia in Canada, and by various communities elsewhere. Second-language speakers of French are distributed throughout many parts...

, "bull's eye") is a term applied to a relatively small oval window, typically for an upper storey, and sometimes set on a roof slope as a dormer

Dormer

A dormer is a structural element of a building that protrudes from the plane of a sloping roof surface. Dormers are used, either in original construction or as later additions, to create usable space in the roof of a building by adding headroom and usually also by enabling addition of windows.Often...

, or above a door to give light. Windows of this type are commonly found in the grand architecture of Baroque

Baroque architecture

Baroque architecture is a term used to describe the building style of the Baroque era, begun in late sixteenth century Italy, that took the Roman vocabulary of Renaissance architecture and used it in a new rhetorical and theatrical fashion, often to express the triumph of the Catholic Church and...

 France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

. The term is also so often applied to similar round windows that this must be considered part of the usage. It is sometimes anglicized as an "ox-eye window". The term initially applied to horizontal oval windows, but is also used for vertical ones.