illuviation

illuviation

[ih-loo-vee-ey-shuhn]
noun
the accumulation in one layer of soil of materials that have been leached out of another layer.

Origin:
1925–30; illuvi(al) + -ation

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World English Dictionary
illuviation (ɪˌluːvɪˈeɪʃən)
 
n
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
 
[C20: from Latin illuviēs dirt, mud, from il- + -luviēs, from lavere to wash]
 
il'luvial
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
illuviation   (ĭ-l'vē-ā'shən)  Pronunciation Key 
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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