alluvium

noun
al·​lu·​vi·​um | \-vē-əm \
plural alluviums or alluvia\-​vē-​ə \

Definition of alluvium 

: clay, silt, sand, gravel, or similar detrital material deposited by running water

First Known Use of alluvium

1810, in the meaning defined above

History and Etymology for alluvium

Medieval Latin, alteration of Latin alluvio

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The first known use of alluvium was in 1810

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