from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a fine-grained fertile soil deposited by water flowing over flood plains or in river beds
Sorry, no etymologies found.
The ruins of the ancient site were barely recognisable, humps of turf and low circles of unworked rocks set close into the ground, some of them nearly swallowed up by the alluvial soil and others exposed in patches of peaty bog.
Bountifully endowed with heavy metals, productive oceans, and rich alluvial soil for farming, it lay on the fringe of the Commonwealth flanking a bulge of the AAnn Empire and the impossibly distant galactic edge.
It dawns on me that they are all along the river banks, self-seeded in the black alluvial soil from nuts washed down in the winter floods, lodging in rock fissures.
Herodotus knew that the Nile valley flooded every year, depositing rich alluvial soil on the fertile fields on either side of the river, but he did not know why this happened.