1. The hour after midnight, when witches and other supernatural beings were thought to be active

Encyclopedia: Witching hour

• owner-driver
• owner-occupied
• owner-occupier
• ownerless
• ownership
• ox
• ox-eyed
• ox-eyed daisy
• oxacillin
• oxalacetate
• oxalacetic acid
• oxalate
• oxalic acid
• Oxalidaceae
• oxalis
• Oxalis acetosella
• Oxalis caprina
• Oxalis cernua
• Oxalis corniculata
• Oxalis crenata
• Oxalis pes-caprae
• Oxalis tuberosa
• Oxalis violacea
• oxaloacetate
• oxaloacetic acid