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thalweg

[tahl-veg, -veyk] /ˈtɑl vɛg, -veɪk/
noun
1.
a line, as drawn on a map, connecting the lowest points of a valley.
2.
Chiefly International Law. the middle of the main navigable channel of a waterway that serves as a boundary line between states.
Origin of thalweg
1860-1865
1860-65; < German, equivalent to Thal, now obsolete spelling of Tal valley (cognate with dale) + Weg way1
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thalweg

thalweg

/ˈtɑːlvɛɡ/
noun (geography, rare)
1.
the longitudinal outline of a riverbed from source to mouth
2.
the line of steepest descent from any point on the land surface
Word Origin
C19: from German, from Thal valley + Weg way, path
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for thalweg
n.

1831, from German Thalweg "path along the bottom of a valley," from thal (see dale) + weg (see way).

Online Etymology Dictionary, © 2010 Douglas Harper
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thalweg in Science
thalweg
  (täl'věg')   
  1. The line defining the lowest points along the length of a river bed or valley, whether underwater or not.

  2. A subterranean stream following a course similar to that of an overlying surficial stream.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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