Definition of oeil-de-boeuf in English:

oeil-de-boeuf

noun

Architecture
  • A small round window.

    • ‘Because of its shape, an ox-eye or oeil-de-boeuf was also a small round window.’

Origin

Mid 18th century: French, literally ox-eye.

Pronunciation:

oeil-de-boeuf

/ˌəēdəˈbəf/