OEil-de-boeuf \[OE]il`-de-b[oe]uf"\, n.; pl.
{[OE]ils-de-b[oe]uf}. [F., lit., eye of an ox.] (Arch.)
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.
[Webster 1913 Suppl.]