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.
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