œil-de-bœuf /œ-ē-də-bœfˈ/

1. A small round window
2. An octagonal vestibule at the court of Versailles, hence one elsewhere

• Rupert's drop
• Rupert's drops
• rupestrian
• rupia
• rupiah
• rupiahs
• rupias
• rupicoline
• serrates
• serrati
• serrating
• serration
• serrations
• serratirostral
• serratulate
• serrature
• serratures
• serratus
• serratuses
• serre
• serred
• serrefile
• serrefiles
• serres
• serricorn