Definition of alluvial adjective from the Oxford Advanced Learner's Dictionary

 

alluvial

 adjective
adjective
BrE BrE//əˈluːviəl//
 
; NAmE NAmE//əˈluːviəl//
 
[usually before noun](geology)
 
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made of sand and earth that is left by rivers or floods alluvial deposits/soil/plains
See the Oxford Advanced American Dictionary entry: alluvial