the movement through the soil of materials brought into suspension or dissolved by the action of water.

1925–30; eluviate + -ion

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World English Dictionary
eluviation (ɪˌluːvɪˈeɪʃən)
the process by which material suspended in water is removed from one layer of soil to another by the action of rainfall or chemical decomposition
[C20: from eluvium]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
eluviation   (ĭ-l'vē-ā'shən)  Pronunciation Key 
The lateral or downward movement of the suspended material in soil through the percolation of water. Eluviation differs from leaching in that it affects suspended, not dissolved, material and usually results only in the movement of the material from one soil horizon to another.
The American Heritage® Science Dictionary
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Example sentences
Pans formed from equipment traffic, or natural eluviation processes can also affect water movement.
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