oeil-de-boeuf /ˌʌ(r)dəˈbʌf, ˌʌɪ-/
oeil-de-boeuf n.; pl. oeils-de-boeuf . 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.
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