1. Sloping downward toward each other to create a trough

Antonym: anticlinal

• sootiness
• sooty
• sooty-black
• sop
• sop up
• soph
• Sophia Loren
• Sophie Tucker
• sophism
• sophist
• sophistic
• sophistical
• sophisticate
• sophisticated
• sophistication
• sophistry
• Sophocles
• sophomore
• sophomore class
• sophomoric
• Sophonias
• Sophora
• Sophora japonica
• Sophora secundiflora
• Sophora sinensis