1. Composed of or relating to fine soil material that has been deposited by the wind: The eluvial soil that was blown by the storm onto the cars, store windows, etc. was washed off the next day.
2. Relating to dirt that has lost soil particles because of wind or washing by water: The agronomist, Mr. Younge, was checking the eluvial contents of the top layer of the farmer's mineral particles that were mixed with organic matter to determine if it would be worth trying to grow crops there.