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

• lucifugous
• lucigen
• lucigens
• Lucina
• Lucite
• luck
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• luckenbooth
• Luckenbooth brooch
• luckenbooths
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