œil-de-bœuf /œ-ē-də-bœfˈ/

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

• backfall
• backfalls
• backfield
• backfields
• backfile
• backfiles
• backfill
• backfilled
• backfilling
• backfillings
• backfills
• backfire
• backfired
• backfires
• backfiring
• backfisch
• backfisches
• backfitting
• backfittings
• backflip
• backflips
• back-formation
• back-formations
• back-friend
• back-friends