pl. -·vi·ums or -·via
sand, clay, silt, etc. gradually deposited by moving water, as along a riverbed or the shore of a lake
Origin of alluviumL, neuter of alluvius: see alluvion
nounpl. al·lu·vi·ums or al·lu·vi·a
Sediment deposited by flowing water, as in a riverbed, flood plain, or delta. Also called alluvion.
Origin of alluviumMedieval Latin, flood, from neuter of Latin alluvius, alluvial, from alluere, to wash against; see alluvion.
alluvium - Legal Definition
The land created by alluvion.