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Noun: alluvium (alluvia)  u'loo-vee-um
  1. Clay, silt or gravel carried by rushing streams and deposited where the stream slows down
    "The river delta was formed by centuries of alluvia";
    - alluvial sediment, alluvial deposit, alluvion

Derived forms: alluvia

Type of: deposit, sediment

Encyclopedia: Alluvium