Definition of illuviation in English:

illuviation

Pronunciation /iˌlo͞ovēˈāSHən/ /ɪˌluviˈeɪʃən/

noun

Soil Science
  • The introduction of salts or colloids into one soil horizon from another by percolating water.

    ‘The study also indicates that the illuviation of clay particles and their subsequent accumulation in the Bt horizons have occurred in sodic environment.’
    • ‘Clay illuviation is the process that has been most exhaustively considered in micromorphological studies.’

Origin

Early 20th century from il-‘in’ + -luvial (on the pattern of alluvial) + -ation.