illuviation

il·lu·vi·a·tion

[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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
illuviation (ɪˌluːvɪˈeɪʃən) [Click for IPA pronunciation guide]
 
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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00:10
Illuviation is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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.
The American Heritage® Science Dictionary
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