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English definition of “alluvium”

alluvium

noun [U] uk   /əˈluː.vi.əm/ specialized us  
earth and sand that has been left by rivers, floods, etc.
alluvial
adjective uk   /-əl/ us  
an alluvial plain Some alluvial deposits are a rich source of diamonds.
(Definition of alluvium from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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