flood plain
Advanced English Dictionary
Updated: 14/03/2018: A new open-source Javascript engine/library named Howler has been employed to handle audiofile. Enjoy pronunciation!UK 
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+ noun
an area of flat land beside a river that regularly becomes flooded when there is too much water in the river
an area of flat land beside a river that regularly becomes flooded when there is too much water in the river
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Updated: 05/06/2018: List of Academic Words