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alluvium

noun [U]
 
 
/əˈluː.vi.əm/ specialized

Definition

earth and sand that has been left by rivers, floods, etc.The Earth and outer space - general words alluvial
 
 
/-əl/ adjective
an alluvial plain Some alluvial deposits are a rich source of diamonds.The Earth and outer space - general words
(Definition of alluvium noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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