alluvial

adjective

1. of or relating to alluvium.

noun

2. alluvial soil.
3. Australia. gold-bearing alluvial soil.

adjective

1. of or relating to alluvium

noun

2. another name for alluvium
3. Australian and NZ alluvium containing any heavy mineral, esp gold

Plural alluviums alluvia

1. Sand, silt, clay, gravel, or other matter deposited by flowing water, as in a riverbed, floodplain, delta, or alluvial fan. Alluvium is generally considered a young deposit in terms of geologic time.