Noun
(soil science, countable) The sideways or downward movement of dissolved or suspended material within soil caused by rainfall
(geology, uncountable) Creation of geological deposits (eluvial deposits) by in situ weathering or weathering plus gravitational movement or accumulation.
Source: en.wiktionary.orgThe master horizon, E, is used for subsurface horizons that have a significant loss of minerals (eluviation). Source: Internet
They have subsurface horizon formation but show little eluviation and illuviation. Source: Internet