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thalweg

[tahl-veg, -veyk]

noun

a line, as drawn on a map, connecting the lowest points of a valley.

Chiefly International Law. the middle of the main navigable channel of a waterway that serves as a boundary line between states.

Origin:
1860–65; < German, equivalent to Thal, now obsolete spelling of Tal valley (cognate with dale) + Weg way¹

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Thalweg is always a great word to know.

So is quincunx. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.

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Collins

World English Dictionary

thalweg or talweg (ˈtɑːlvɛɡ)

—n
1.	the longitudinal outline of a riverbed from source to mouth
2.	the line of steepest descent from any point on the land surface

[C19: from German, from Thal valley + Weg way, path]

talweg or talweg

—n

[C19: from German, from Thal valley + Weg way, path]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Science Dictionary

thalweg

(täl'věg') Pronunciation Key

The line defining the lowest points along the length of a river bed or valley, whether underwater or not.
A subterranean stream following a course similar to that of an overlying surficial stream.

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thalweg

thal·weg