from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
  • n. The natural line of descent, as for skiing, between two points on a slope.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A geomorphologic unconformity marking a boundary between an upland region and a plane; sometimes marked by a series of waterfalls on rivers that cross it.
  • n. The imaginary line downhill that something falling downhill would naturally follow.


Sorry, no etymologies found.


    Sorry, no example sentences found.


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