Definition of floodplain noun from the Oxford Advanced Learner's Dictionary

 

floodplain

 noun
noun
BrE BrE//ˈflʌdpleɪn//
 
; NAmE NAmE//ˈflʌdpleɪn//
 
Rivers and lakes
 
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an area of flat land beside a river that regularly becomes flooded when there is too much water in the river See related entries: Rivers and lakes