[i-loo-vee-ey-shuh
n] 
| the accumulation in one layer of soil of materials that have been leached out of another layer. |
| il·lu·vi·a·tion (ĭ-lōō'vē-ā'shən) n. The deposition in an underlying soil layer of colloids, soluble salts, and mineral particles leached out of an overlying soil layer. [illuvial, resulting from illuviation (in-2 + -luvial, relating to the action of flowing water as in alluvial) + -ation.] |