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.

The leached (emptied or drained) upper part of a soil profile: The eluvial layer that lost the essential soil minerals from its light sandy soils was caused by a year of excessive rain.

A mineral deposit concentrated near a decomposed outcrop of the source and deposited by rain wash rather than by stream action: Tom, the geologist, determined that the eluvial placer had an accumulation of valuable minerals that were formed by a gravity separation during the sedimentary processes of precipitation.

When there are eluvial placers full of heavy minerals, they become concentrated in streams, beaches, and residual gravels, and form placer deposits that include gold, platinum, cassiterite (source of tin), magnetite (ore of iron), chromite (chromium ore), ilmenite (source of titanium), rutile (another source of titanium), native copper, zircon (bluish-white gems), monazite (rare-earth elements), and various kinds of gemstones.