thalweg or talweg /tälˈveg, -vāhh/ (geology)

1. The longitudinal profile of the bottom of a river bed
2. The middle of a main navigable waterway, acting as a boundary between states

• cental
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• centare
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• centas
• centaur
• centaurea
• centaureas
• centaurian
• centauries
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• Centaurus
• centaury
• centavo
• centavos
• centenarian
• centenarianism
• centenarianisms
• centenarians
• centenaries
• centenary
• centenier
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• centennial
• centennials