befoul /bi-fowlˈ/

1. To make foul
2. To soil

• ornithopters
• ornithorhynchus
• ornithosaur
• ornithosaurs
• ornithoscopies
• ornithoscopy
• ornithoses
• ornithosis
• Orobanchaceae
• orobanchaceous
• Orobanche
• orogen
• orogeneses
• orogenesis
• orogenetic
• orogenic
• orogenic belt
• orogenic belts
• orogenies
• orogens
• orogeny
• orographic
• orographical
• orographically
• orographies