alluvial soil

Noun
  1. A fine-grained fertile soil deposited by water flowing over flood plains or in river beds (synset 114743886)
    is a type of: dirt, soil - the part of the earth's surface consisting of humus and disintegrated rock
    substance meronym: alluvial deposit, alluvial sediment, alluvion, alluvium - clay or silt or gravel carried by rushing streams and deposited where the stream slows down

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