Origin of mudflow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
geology a flow of soil or fine-grained sediment mixed with water down a steep unstable slope
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
A downhill movement of soft, wet, unconsolidated earth and debris, made fluid by rain or melted snow and often building up great speed.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.