alluvium /əˈl(j)uːvɪəm/

a

I. noun [ mass noun]

1. a deposit of clay, silt, and sand left by flowing floodwater in a river valley or delta, typically producing fertile soil.
– origin mid 17th cent.: Latin, neuter of alluvius ‘washed against’, from ad- ‘towards’ + luere ‘to wash’.

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