il•lu•vi•al(i lo̅o̅′vē əl, i lo̅o̅v′yəl),USA pronunciationadj.
Agriculture, Geologyof or pertaining to illuviation or illuvium.
Latin illuvi(ēs) mud, flood, literally, what washes or is washed in (il-il-1 + -luv-, combining form of lavere to wash + -iēs noun, nominal suffix) + -al1; see alluvial