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mudflow

[muhd-floh]
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noun Geology.
  1. a flow of mixed earth debris containing a large amount of water.
  2. the dried-out product of such a flow.
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Origin of mudflow

First recorded in 1900–05; mud + flow
Also called mud slide, mudspate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for mudflow

mudflow

noun
  1. geology a flow of soil or fine-grained sediment mixed with water down a steep unstable slope
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
mudflow in Science

mudflow

[mŭd′flō′]
  1. A downhill movement of soft, wet, unconsolidated earth and debris, made fluid by rain or melted snow and often building up great speed.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.