of or pertaining to eluviation or eluvium.

1860–65; eluvi(um) + -al1

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World English Dictionary
eluvium (ɪˈluːvɪəm)
n , pl -via
a mass of sand, silt, etc: a product of the erosion of rocks that has remained in its place of origin
[C19: New Latin, from Latin ēluere to wash out]

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Example sentences
The eluvial parent material for these soils contains some limestone rock fragments.
Eluvial placers have been referred to as residual deposits.
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