%oeil-de-boeuf%

‖n.; pl. oeils-de-boeuf /plu>. [ 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. ]