oeil-de-boeuf

noun, plural oeils-de-boeuf [French œ-yuh-duh–bœf] /French ˌœ yə dəˈbœf/.

1. a comparatively small round or oval window, as in a frieze.

noun plural oeils-de-boeuf (œjdəbœf)

1. a circular window, esp in 17th- and 18th-century French architecture