Al·lu·vi·um n.; pl. E. Alluviums, L. Alluvia Geol. Deposits of earth, sand, gravel, and other transported matter, made by rivers, floods, or other causes, upon land not permanently submerged beneath the waters of lakes or seas.
n : clay or silt or gravel carried by rushing streams and
deposited where the stream slows down [syn: alluvial
sediment, alluvial deposit, alluvion]
[also: alluvia (pl)]