1) Oval window 2) Small, round window 
Oeil-de-boeuf, also œil de bœuf, (French, `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, or above a door to give light. Windows of this type are commonly found in the grand architecture of Baroque France. The term is also so often applied to simi......
• (n.) A circular or oval window; -- generally used of architecture of the 17th and 18th centuries. A famous room in the palace of Versailles bears this name, from the oval window opening into it.
[n] - a circular or oval window
noun a circular or oval window; 17th or 18th century French architecture