GNU Collaborative International Dictionary of English

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1.       
   Avalanche , n. [F. avalanche, fr. avaler to descend, to let down, from aval down, downward;  (L. ad) + val, L. vallis, valley. See Valley.]
   A large mass or body of snow and ice sliding swiftly down a mountain side, or falling down a precipice.
   1913 Webster
   A fall of earth, rocks, etc., similar to that of an avalanche of snow or ice.
   1913 Webster
   A sudden, great, or irresistible descent or influx of anything.
   1913 Webster