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Definition of ILLUVIATION
: accumulation of dissolved or suspended soil materials in one area or horizon as a result of eluviation from another
Origin of ILLUVIATION
2in- + -luviation (as in eluviation)
First Known Use: 1928
Accumulation of dissolved or suspended soil materials in one area or layer as a result of leaching (percolation) from another. Usually clay, iron, or humus wash out and form a line with a different consistency and color. These lines are important for studying the composition and ages of rock strata.