Thalweg

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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

From WordNet (r) 2.0 [wn]:

  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