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alluvium (n.)

"matter deposited by flowing water," 1660s, from noun use of Medieval Latin alluvium, neuter of alluvius "washed against," from Latin alluere "wash against," from ad "to, against" (see ad-) + -luere, combining form of lavere "to wash" (from PIE root *leue- "to wash").

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Definitions of alluvium from WordNet

alluvium (n.)
clay or silt or gravel carried by rushing streams and deposited where the stream slows down;
Synonyms: alluvial sediment / alluvial deposit / alluvion
From wordnet.princeton.edu