[ ih-loo-vee-ey-shuh n ]
/ ɪˌlu viˈeɪ ʃən /


the accumulation in one layer of soil of materials that have been leached out of another layer.

Origin of illuviation

First recorded in 1925–30; illuvi(al) + -ation Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for illuviation


/ (ɪˌluːvɪˈeɪʃən) /


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

Derived Forms

illuvial, adjective

Word Origin for illuviation

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

Science definitions for illuviation


[ ĭ-lōō′vē-āshən ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.