from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A swift downhill current in water, air, or other fluid, triggered by the weight of suspended material such as silt in a current flowing down a continental shelf or snow in an avalanche.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A fast-flowing downhill current (of air or water) that carries silt
Sorry, no etymologies found.