• synonyms


[ih-loo-vee-ey-shuh n]
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  1. the accumulation in one layer of soil of materials that have been leached out of another layer.
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Origin of illuviation

First recorded in 1925–30; illuvi(al) + -ation
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for illuviation


  1. the process by which a material (illuvium), which includes colloids and mineral salts, is washed down from one layer of soil to a lower layer
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Derived Formsilluvial, adjective

Word Origin

C20: from Latin illuviēs dirt, mud, from il- + -luviēs, from lavere to wash
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

illuviation in Science


  1. The deposition of colloids, soluble salts, and suspended mineral particles in a lower soil horizon through the process of eluviation (downward movement) from an upper soil horizon.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.