alluviumnoun [ U ]
uk/əˈluː.vi.əm/us/əˈluː.vi.əm/specializedearth and sand that has been left by rivers, floods, etc.
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alluvial
adjective uk/əˈluː.vi.əl/us/əˈluː.vi.əl/
an alluvial plain
Some alluvial deposits are a rich source of diamonds.