IPA: /ɪˈluːviəl/
KK: /ɪˈluːviəl/
Relating to the process of illuviation, which is the movement of dissolved materials from one layer of soil to another.
The illuvial layer of soil is rich in nutrients that have leached down from the upper layers.
Illuvial is derived from "illuvi" (from Latin "illuvius", meaning washed down) and the suffix "-al" (meaning pertaining to). The term refers to materials that have been washed down or deposited by water, particularly in soil contexts.
Think of materials that have been 'washed down' ('illuvi') and how they are 'pertaining to' ('-al') the soil. This helps you remember that 'illuvial' relates to deposits formed by water.