Search Result for "thalweg": 
Wordnet 3.0

NOUN (2)

1. the middle of the chief navigable channel of a waterway that forms the boundary line between states;

2. a line following the lowest points of a valley;


The Collaborative International Dictionary of English v.0.48:

Thalweg \Thal"weg`\, n. [G., fr. thal valley + weg way. See Dale; Way.] (Physiography) (a) A line following the lowest part of a valley, whether under water or not. (b) The line of continuous maximum descent from any point on a land surface, or that cutting all contours and angles. [Webster 1913 Suppl.] Thammuz
WordNet (r) 3.0 (2006):

thalweg n 1: the middle of the chief navigable channel of a waterway that forms the boundary line between states 2: a line following the lowest points of a valley