1. Sloping downward toward each other to create a trough

Antonym: anticlinal

• noble gas
• noble metal
• noble-minded
• noble-mindedness
• nobleman
• nobleness
• noblesse
• noblesse oblige
• noblewoman
• nobly
• nobody
• NOC
• nocent
• nociceptive
• nock
• noctambulation
• noctambulism
• noctambulist
• noctiluca
• Noctiluca miliaris
• noctilucent
• Noctua
• noctuid
• noctuid moth
• Noctuidae