illuviation[i lo̵̅o̅′vē ā′s̸hən]
the accumulation in an underlying soil layer of materials, as colloids or soluble salts, that have been leached out of an upper layer
Origin of illuviationsee illuvium and amp; -ation
The deposition in an underlying soil layer of colloids, soluble salts, and mineral particles leached out of an overlying soil layer.
Origin of illuviationilluvial, resulting from illuviation (in–2 + -luvial, relating to the action of flowing water, as in alluvial) + –ation.