illuvial

[ih-loo-vee-uhl, ih-loov-yuhl]
adjective
of or pertaining to illuviation or illuvium.

Origin:
1920–25; < Latin illuvi(ēs) mud, flood, literally, what washes or is washed in (il- il-1 + -luv-, combining form of lavere to wash + -iēs noun suffix) + -al1; see alluvial

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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

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Example sentences
Point counting pores and illuvial clay in thin section.
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