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illuvium

noun
il·​lu·​vi·​um
plural illuviums\ -​ēəmz \ or illuvia\ -​ēə \

Definition of illuvium

: material leached from one soil horizon and deposited in another — compare alluvium, colluvium

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History and Etymology for illuvium

New Latin, from in- entry 2 + -luvium (as in alluvium)

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