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Material leached by chemical or other processes from one soil horizon and deposited in another.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



mineral and organic substances leached by rainwater from the upper part of the soil and deposited in its lower parts (the illuvial horizon). Depending on the type of soil, illuvium may consist of humus, iron hydroxides, carbonate, or gypsum.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.