from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The deposition in an underlying soil layer of colloids, soluble salts, and mineral particles leached out of an overlying soil layer.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology The accumulation of suspended material and soluble compounds leached from an overlying stratum


from The American Heritage® Dictionary of the English Language, 4th Edition

[illuvial, resulting from illuviation (in– + -luvial, relating to the action of flowing water, as in alluvial) + –ation.]


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  • The B horizon is a mineral soil layer which is strongly influenced by illuviation.


  • Common characteristics of recognition include immature development of eluviation in the A horizon and illuviation in the B horizon, and evidence of the beginning of weathering processes on parent material sediments.


  • Good drainage enhances an number of pedogenic processes of illuviation and eluviation that are responsible for the development of soil horizons.


  • Generally, these horizons result from the processes of chemical weathering, eluviation, illuviation, and organic decomposition.


  • The most distinguishing characteristics of this soil type are the illuviation of clay in the B horizon, moderate to high concentrations of base cations, and light-colored surface horizons.


  • The deposition of fine mineral particles or dissolved substances in a lower soil layer is called illuviation.


  • B - mineral horizon that shows little or no evidence of the original rock structure and which has been altered by oxidation, and illuviation (addition of minerals, clays, and organic matter from the A horizon).

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