Thalweg Definition
 tälvĕg 
    noun
  
 The line defining the lowest points along the length of a river bed or valley.
 American Heritage 
A subterranean stream.
 American Heritage 
Other Word Forms of Thalweg
Noun
Singular:
 thalwegPlural:
 thalwege, thalwegsOrigin of Thalweg
-  German Talweg, Thalweg Tal, Thal valley (from Middle High German tal) (from Old High German) Weg way (from Middle High German wec, weg) (from Old High German weg wegh- in Indo-European roots) From American Heritage Dictionary of the English Language, 5th Edition 
-  From 19th century German Thal (“valley") + Weg (“way, course") From Wiktionary 
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