noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The line that connects the lowest points in a valley or river channel, and thus the line of fastest flow or deepest water along a river’s course.
2. 2
   a line following the lowest points of a valley wordnet
3. 3
   the middle of the chief navigable channel of a waterway that forms the boundary line between states wordnet

Etymology

Borrowed from 19th century German Thalweg, from Thal (“valley”) + Weg (“way, course”).

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.